Jessica Rinaldi / Reuters

SWAT teams search for the remaining Boston Marathon bombing suspect in Watertown, Mass., on April 19.

CJ Gunther / EPA

A resident watches as police search an apartment complex in Watertown, Mass., on April 19.

NBC News reports: Boston and its surburbs, universities and transit system were on total lockdown Friday as police hunted for marathon bombing suspect Dzhokhar Tsarnaev -- on the loose after his terrorist brother was killed in a stunning chain of events that left one cop dead and another injured, officials said. Read full story

Also on PhotoBlog:

• Life disrupted: Eerie scenes after Boston Marathon bombings
• Marathon's deadly moments captured from office building above finish line
• Anatomy of a bombing: Photos show battery, wires used in device

Slideshow: Search for suspects in Boston Marathon bombings

A tense night of police activity just days after the Boston Marathon bombings caused police to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.

Launch slideshow

Charles Krupa / AP

A woman looks out a window at her home as police start to search an apartment building in Watertown on April 19.

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Reuters

The chief suspect in last month's bombing of Cafe Argana, Adel al-Othmani (C, wearing hat and sunglasses), takes part in questioning by special forces and a reconstruction of the attack in Marrakesh on Tuesday, May 11. The blasts killed 16 people, including eight French tourists, and was the deadliest such attack in Morocco since 12 suicide bombers killed 33 members of the public in coordinated attacks in Casablanca in 2003.

The Associated Press reports:

MARRAKECH, Morocco — Police say the main suspect in the deadly remote-controlled bombing of a Marrakech cafe last month has helped them investigate the crime by showing how it was carried out.

Police say the suspect in the April 28 attack that killed 17 people showed them the path he took from the city's train station to the Argana cafe overlooking Djemaa el-Fna, the city's historic square. The cafe was renowned as a gathering place for tourists.

Continue reading here.

Todd J. Van Emst / AP

Opelika police take a suspect into custody at Southern Union Community College on April 6 in Opelika, Ala. The unidentified man was arrested after he walked up to reporters and told them he was the person police were seeking in connection with a shooting on campus. The shooting at the college killed a 63-year-old woman, wounded two other women, ages 36 and 94, and injured a 4-year-old who was hit with flying glass.

OPELIKA, Ala. — Journalists covering a deadly shooting became part of the story when the man police say is the main suspect calmly walked up to them and told them he was the person authorities were after.

Thomas Franklin May, 34, was charged with capital murder and attempted murder and was being held without bond, Opelika Police Chief Tommy Mangham said.

He said Wednesday's parking lot shooting at a community college campus in eastern Alabama was related to a domestic problem and was preplanned.

One woman was killed and May's estranged wife and another woman were wounded, police said.

About three hours after the shooting, when city officers already had left campus, a man driving a white Jeep Liberty with the same tag number police had released as the suspect's pulled into the blood-splattered parking lot where the shootings happened and spoke to the news media.

Todd van Emst was taking photos for The Associated Press on the Southern Union Community College campus when May came up to him and asked to use his cell phone.

Van Emst said May gestured and said he "did all this."

"I said, 'Are you the shooter? He said, 'Yes.'" Continue reading.