Barcroft Media /Landov

These images show Tamerlan Tsarnaev, identified by investigators as Suspect 1 in the Boston Marathon bombings. The older of the two brothers sought by law enforcement, the 26-year-old was killed in a firefight with police. He was born in Russia, and became a permanent legal resident of the United States in 2007, law enforcement officials said.

Tamerlan Tsarnaev's brother, Dzhokhar, 19, remained at large on Friday.

The suspect in the black hat in photos released by the FBI, Tsarnaev studied at Bunker Hill Community College in Boston and aspired to become an engineer, according to a profile in a Boston University graduate magazine in 2010. He wanted to box for the U.S. Olympic team, according to the profile.

According to an article in The Lowell Sun newspaper, Tsarnaev boxed in a 2004 tournament as part of a program called Golden Gloves. “I like the USA,” he told the newspaper at the time.

In the Boston University magazine photospread, Tsarnaev is shown working out at the Wai Kru Mixed Martial Arts Center in Boston, Mass. He is quoted as saying he loves the movie Borat, and describes himself as a Muslim who does not smoke or drink. “I don’t have a single American friend,” he said. “I don’t understand them.”

Barcroft Media /Landov

Barcroft Media /Landov

Barcroft Media /Landov

Barcroft Media /Landov

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Barcroft Media /Landov

Barcroft Media /Landov

Editor's note: Faces were blurred by the photographer's agency to obscure the identity of other individuals in the pictures.

Related:

• Massive Boston manhunt drags on; anxiety grips city
• Bombing suspect on the run became US citizen last year on Sept. 11
• Timeline of terror hunt: From release of suspect photos to rolling shootout

Glenn Depriest / Getty Images

Tamerlan Tsamaev, left, fights Lamar Fenner during the 201-pound division boxing match during the 2009 Golden Gloves National Tournament of Champions May 4, 2009 in Salt Lake City, Utah.

GRAPHIC WARNING: Contains images which some viewers may find disturbing. 

Mohamed Abdiwahab / AFP - Getty Images

A member of the Somali security forces flees the site of a car bomb in central Mogadishu, Somalia, on March 18, 2013.

Mohamed Abdiwahab / AFP - Getty Images

A woman reacts near the site of a car bomb in central Mogadishu on March 18, 2013.

Reuters reports — A car bomb exploded near the presidential palace in the Somali capital Mogadishu on Monday, killing at least 10 people in a blast that appeared to target senior government officials, police said.

The suicide attacker detonated explosives while driving along a boulevard that runs between the palace and the national theatre, a route lined by tearooms that were engulfed in fire moments after the blast, senior police officer Abdiqadir Mohamud said. A public minibus driving along the road burst into flames.

"The suicide car bomber targeted a senior national security officer whose car was passing near the theatre," Mohamud told Reuters. "Most of the people who died were on board the minibus - civilians. This public vehicle coincidentally came between the government car and the car bomb when it was hit." Read the full story.

Feisal Omar / Reuters

An injured man sits on the road near the presidential palace in Mogadishu on March 18, 2013.

Keith Bedford / Reuters

Stephen Knapp, center left, is comforted by Charles Maikish, former World Trade Center director, as mourners and family members of victims participate in a 20th anniversary memorial for victims of the 1993 bombing of the World Trade Center in New York on Feb. 26.

Justin Lane / EPA

Flowers are seen next to the North Tower Reflecting Pool.

A moment of silence was observed at 12:18 p.m., the time when a truck bomb was detonated below the north tower on Feb. 26, 1993. The victims' names were read by family members before bagpipers played "Amazing Grace."

More than 1,000 people were injured in the 1993 blast in an underground garage below one of the towers. It was the first dramatic demonstration that "terrorism is theater and New York is the biggest stage," Police Commissioner Raymond Kelly said last week.

Verena Dobnik, The Associated Press

Read the full story.

GRAPHIC WARNING: Contains images which some viewers may find disturbing. 

SANA via AP

Syrian security agents next to a vehicle on fire following a huge explosion in Damascus on Feb. 21, 2013.

SANA via Reuters

Vehicles burn near a crater on a road after an explosion in central Damascus on Feb. 21, 2013

By The Associated Press

Syrian state TV says 53 people were killed and more than 200 wounded in a car bomb attack near the headquarters of the ruling Baath party in central Damascus.

The bomb was one of at least three attacks in the heart of the city on Thursday. A second blast shook another neighborhood and mortar rounds exploded near the Syrian Army General Command.

The Britain-based activist group the Syrian Observatory for Human Rights said 42 had been killed in the car bombing, most of them civilians.

The difference in the death tolls could not be immediately reconciled. Click here for updates on this developing story.

EDITOR'S NOTE: Pictures released by the state-run Syrian Arab News Agency. 

SANA via EPA

A thick black pall of smoke fills the air close to the site of a large explosion in Damascus on Feb. 21, 2013.

SANA via EPA

Wounded men sit near destroyed cars and other damage following a large explosion in Damascus on Feb. 21, 2013.

SANA via AP

Syrian security agents carrying a body following a huge explosion that shook central Damascus on Feb. 21, 2013.

SANA via EPA

Clouds of smoke swirling around destroyed cars following a large explosion in Damascus on Feb. 21, 2013.

SANA via AP

An injured man lying on the ground after a huge explosion in Damascus on Feb. 21, 2013.

Slideshow: Syria uprising

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A look back at the conflict that has overtaken the country.

Launch slideshow

This story was originally published on Thu Feb 21, 2013 6:25 AM EST

Omar Sobhani / Reuters

Afghan security forces run on the roof of the Kabul traffic police headquarters as it is attacked by insurgents on Jan. 21, 2013.

Reuters reports — Suicide bombers and gunmen launched an eight-hour assault on the headquarters of the Kabul traffic police on Monday, Afghan officials said, in the second coordinated attack on a government building in less than a week.

The Taliban claimed responsibility for the operation in which all five attackers and three traffic police officers were killed, interior ministry officials said.

The attack raised the possibility that insurgents were shifting tactics, testing Afghan security forces in Kabul after a series of high-profile attacks on Western targets last year. Read the full story.

Omar Sobhani / Reuters

Afghan police officers run to the Kabul traffic police headquarters as it is attacked by insurgents on Jan. 21, 2013.

Shah Marai / AFP - Getty Images

Black smoke billows from the Afghan police headquarters during an attack in Kabul on Jan. 21, 2013.

Slideshow: Afghanistan: Nation at a crossroads

Aref Karimi / AFP - Getty Images

More than ten years after the beginning of the war, Afghanistan faces external pressure to reform as well as ongoing internal conflicts.

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Hadi Mizban / AP

Neighbors react a day after a bomb blast on Zahra Shiite mosque in the Hurriya neighborhood of Baghdad on Nov. 28, 2012.

Mohammed Ameen / Reuters

A man stands amid debris after a bomb attack in the Shuala district of Baghdad on November 28, 2012. The deadliest of three attacks occurred in the Shuala district, where a car bomb parked outside a Shiite place of worship exploded as people were leaving the building, killing nine.

Reuters reports — Three car bombings killed 23 Shiite Muslims during mourning processions in the Iraqi capital Baghdad on Tuesday, police and hospital sources said.

Bombs target Kurds in Iraq's disputed north

Dozens more were injured in the explosions. They struck during the holy month of Ashoura, of special significance to Shiites who are prime targets of al Qaeda's Iraqi affiliate and other Sunni Muslim insurgents. Read the full story.

Mohammed Ameen / Reuters

Residents gather at the site of a car bomb attack in the Shuala district of Baghdad on Nov. 28, 2012.

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Emad Matti / AP

People react at the scene of a bomb attack in Kirkuk, Iraq on Nov. 27, 2012. Three parked car bombs exploded Tuesday morning simultaneously in the city of Kirkuk, home to a combustible mix of Kurds, Sunni Arabs and Turkomen who all claim rights to the city, police said.

Ako Rasheed / Reuters

A Kurdish security officer stands guard next to the destroyed headquarters of the Kurdistan Democratic Party (PDK) after a bomb attack in Kirkuk on Nov. 27, 2012.

Reuters reports — Bombs targeting ethnic Kurds killed four people on Tuesday in the city of Kirkuk in Iraq's disputed northern territories, where the Iraqi army and troops from the autonomous Kurdistan region have been in stand-off for more than a week.

It was not immediately clear who was behind the attacks although Sunni Islamist insurgents including a local affiliate of al Qaeda continue to strike regularly, killing 144 people across Iraq in October alone.

After decades of oppression, Kurds in Syria get taste of freedom

The latest bomb attacks come after troops from Baghdad and the Kurdistan region moved in last week on the territories over which both the central government and the Kurds claim jurisdiction. Read the full story.

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Oded Balilty / AP

Police and security personnel rush to the site of a bombing on a bus in Tel Aviv, Israel on Nov. 21, 2012.

Oded Balilty / AP

Rescue workers and paramedics carry a wounded person from the site of a bus bombing in Tel Aviv on Nov. 21, 2012.

Oded Balilty / AP

Police officers examine a blown up bus at the site of a bombing in Tel Aviv on Nov. 21, 2012.

Oded Balilty / AP

A wounded person is taken away from the site of a bus bombing in Tel Aviv on Nov. 21, 2012.

Slideshow: Israel, Gaza violence escalates

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Two sides exchange deadly airstrikes, rocket attacks.

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By NBC News staff and wire reports — An explosion on a bus in Tel Aviv Wednesday injured 10 people, three seriously, a medical official told NBC News as the deadly Gaza crisis continued.

The blast happened as Israeli airstrikes continued to shake the Gaza Strip and Palestinian rockets were fired into Israel, amid negotiations about a possible truce.

"This was a terrorist attack," Ofir Gendelman, a spokesman for Israeli Prime Minister Benjamin Netanyahu, told Reuters.

Click here for updates on this developing story.

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Carl De Souza / AFP - Getty Images

Kenyan police officers detain a man in the Somali district of Eastleigh in Nairobi on Monday.

GRAPHIC WARNING: Contains images which some viewers may find disturbing. 

Updated at 12:45 pm ET

Tony Karumba / AFP - Getty Images

A youth of non-Somali ethinicity is armed with stones on Monday during inter-ethnic clashes in Nairobi's Eastleigh suburb.

Reuters reports — Kenyan police fired tear gas to disperse rioters who attacked ethnic Somalis in the Nairobi district known as "Little Mogadishu" on Monday, hurling rocks and smashing windows after a weekend bomb attack there killed nine people.

The violence coincided with the start of voter registration for a general election in March, adding to security concerns ahead of the first national polls since 2007 when a dispute over the results fuelled ethnic slaughter that killed more than 1,200 people and forced some 300,000 from their homes.

Angry mobs broke into Somali homes and shops in anger at Sunday's attack on a minibus which killed at least nine people in Nairobi's Eastleigh district which is dominated by Somali Kenyans and their ethnic kin who have fled fighting in Somalia.

Read the full story.

Daniel Irungu / EPA

Angry ethnic Somali youths shout slogans as they face off Kenyan youths during a riot in the predominantly Somali neighborhood of Eastleigh in Nairobi on Monday.

Carl De Souza / AFP - Getty Images

A Kenyan Police officer with a guard dog tries to control a crowd in the Somali district of Eastleigh in Nairobi on Monday. Kenyan residents in Eastleigh turned on Somalis and attacked their shops and stalls, accusing them of being responsible for a bomb on Sunday.

Carl De Souza / AFP - Getty Images

A suspected looter is restrained by a policeman with a dog in the Somali district of Eastleigh in Nairobi on Monday.

Tony Karumba / AFP - Getty Images

A man bleeds after he was attacked with machetes by people of Somali ethnicity on Monday during inter-ethnic clashes in Nairobi's Eastleigh suburb.

Noor Khamis / Reuters

Mathare slum residents escape from a cloud of tear gas thrown by the police during the second day of skirmishes in the Eastleigh neighborhood of Kenya's capital Nairobi on November 19, 2012.

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SANA via EPA

People gather at the site where a car bomb exploded in the Al Rawda area of Jaramana, southern Damascus, on October 29, 2012.

SANA via EPA

People inspecting damage at the site where a car bomb exploded in the Al Rawda area of Jaramana, southern Damascus on October 29, 2012.

SANA via EPA

A general view of the site where a car bomb exploded.

NBC News wire services report — Syrian jets bombed suburbs of Damascus and a car bomb killed 10 people in the capital on Monday, the last day of a four-day truce that U.N. chief Ban Ki-moon acknowledged had failed.

Each side blamed the other for breaching the Eid al-Adha truce arranged by international envoy Lakhdar Brahimi, who nevertheless promised to pursue his peace efforts.

Syrian state television said women and children were among those killed or wounded by a "terrorist car bomb" near a bakery in Jaramana, in the southeast of Damascus. Local residents say the district is controlled by Assad loyalists. Read the full story.

EDITOR'S NOTE: Pictures released by the state-run Syrian Arab News Agency. 

SANA via EPA

People gathering at the site of the explosion.

SANA via EPA

An injured girl on a stretcher after receiving first aid.

SANA via EPA

People in a damaged building at the site of the explosion.

Related content:

• One street in Aleppo: Life goes on as death lurks around every corner
• Slideshow: Conflict in Syria
• The fragility of life in Syria's borderlands
• Amid Syria's civil war violence, a strange calm in the capital
• Slideshow: The lives of Syrian rebels
• The battle for Aleppo: My 18 days with the Syrian rebels
• Who are the Syrian rebels?
• Are children fighting on Syria's rebel front lines?
• 'Catastrophe': Journalist behind the lines in Syria sees no end to war
• On the road with Syria's rebel motorcycle army
• Glimpses of escalating conflict in Syria

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Sonny Tumbelaka / AFP - Getty Images

Survivors and relatives of victims of the October 12, 2002 Bali bombings cry during a ceremony marking the 10th anniversary of the attack at the Garuda Wisnu Kencana cultural park in Jimbaran, Bali on October 12, 2012.

Johannes Christo / Pool via Getty Images

Thousands of family members, friends and general public gathered to remember the victims of the 2002 Kuta nightclub bombings which killed 202 people, including 88 Australians.

The Associated Press reports from Bali, Indonesia — A decade after twin bombs killed scores of tourists partying at two nightclubs on Indonesia's resort island of Bali, survivors and victims' families on Friday braved a fresh terrorism threat to remember those lost to the tragedy. 

Bay Ismoyo / AP

A woman grieves as she attends the memorial service.

The 2002 bombing was Asia's deadliest terror strike, killing 202 people — including 88 Australians and seven Americans — and injuring more than 240 others partying at the popular Sari Club and Paddy's Pub in Kuta that Saturday night. The attack was carried out by suicide bombers from the al-Qaida-linked group Jemaah Islamiyah and kick started a wave of violence that would hit an embassy, hotels and restaurants in the world's most-populous Muslim-majority nation.

Surgeon Fiona Wood, who led a team of Australian doctors that treated victims horribly burned in the attack, spoke of the survivors' bravery.

"A young woman whose injuries were beyond comprehension. The first thing she said when she came out of her coma was, 'I'll never run; will I walk again?'" Wood recalled. "I said, 'You will walk, you will run, you will race.' And in 2008, she beat me in an ironman." Read the full story.

Murdani Usman / Reuters

A survivor of the bomb blast is helped by her family as they arrive for the commemoration service for the 10th anniversary of the Bali bombing.

Justin McManus / Pool via Getty Images

Emotional family members pay their respects at picture boards of the victims during the memorial service.

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