Omar Faruk / Reuters

Relatives assist an unidentified woman injured in an explosion at the national theater in Mogadishu, Somalia, on April 4, 2012.

Omar Faruk / Reuters

Residents assist an unidentified man injured in the explosion.

NBC News, msnbc.com staff and news services report — The president of Somalia's Olympic committee and the head of the country's soccer federation have been killed in a suicide blast at Mogadishu's newly reopened national theater that left at least 10 dead, according to reports.

Sports official Shafici Mohyadin said the two were killed on Wednesday when the blast hit the first anniversary celebration of Somalia's television station, according to the Associated Press.

Ali Muse, the head of Mogadishu's ambulance service, said at least 10 people were killed and dozens wounded, including the country's national planning minister.

Al-Shabab, the regional terror group affiliated to al-Qaida, claimed reponsibility for the attack, Reuters reported. Read more.

Omar Faruk / Reuters

Policemen and residents secure the national theater after the explosion.

Mohamed Sheikh Nor / AP

Somalis stretcher away a man wounded in the blast.

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Mohamed Sheikh Nor / AP

People carry a wounded man at the scene of an explosion in Mogadishu, Somalia, on Oct. 4. Dozens of people were reported killed after a car laden with explosives blew up in front of the Ministry of Education in the Somali capital.

Mohamed Sheikh Nor / AP

A soldier keeps guard near a burning vehicle at the scene of an explosion in Mogadishu on Oct. 4.

msnbc.com news services report from MOGADISHU:

A truck bomb killed at least 65 people at government buildings in the heart of Somalia's capital on Tuesday, an ambulance worker said, and al-Shabab insurgents claimed responsibility for the attack.

Witnesses said there was a loud blast at a compound housing four government ministries in the K4 (Kilometer 4) area of the capital Mogadishu, where students had gathered on Tuesday to take exams.

"We have carried 65 dead bodies and 50 injured people," ambulance coordinator Ali Muse told Reuters. "Some are still lying there. Most of the people have burns." Continue reading.

Feisal Omar / Reuters

American born Islamist militant fighter Omar Hammami, also known as Abu Mansur Al-Amriki, addresses a news conference at a farm in southern Mogadishu's Afgoye district on Wednesday, May 11. Amriki and four other foreign fighters in Somalia spoke at the gathering and vowed to avenge the death of Osama Bin Laden.

AP reports from Mogadishu, Somalia: An American fighting for an al-Qaida linked militant group in wartorn Somalia is threatening to avenge the death of Osama bin Laden.

Omar Hammami, known as Abu Mansur al-Amriki, or "the American," said Wednesday that bin Laden's death does not mean the end of attacks against U.S. interests.

Hammami is among hundreds of foreign fighters in the ranks of the al-Shabab, Somalia's most dangerous militant group, that is trying to topple the country's weak U.N.-backed government.

Al-Shabab carried out its first international attack last July in Uganda, killing 76 people watching the World Cup final in two bomb explosions.

Hammami grew up in the middle-class town of Daphne, Alabama, before joining the militants in 2007.

In a profile last year, The New York Times dubbed him "The Jihadist Next Door" because of his unlikely journey from a Southern Baptist upbringing to a key post in an Islamist guerrilla army.

Farah Abdi Warsameh / AP

Omar Hammami, right, and deputy leader of al-Shabab Sheik Mukhtar Abu Mansur Robow, left, sit under a banner which reads 'Allah is Great' as they speak at a press conference in Afgoye, Mogadishu on May 11.

See our slideshows of Osama bin Laden's compound and world reaction to his death.

Related stories:

• American militant in Somalia releases martyr's rap
• 14 U.S. citizens charged with trying to join Somali terror group
• FBI: Uganda attacks signal terror group potential
• Plenty of targets remain after bin Laden
• Scattered al-Qaida needs 'miracle' to recover
• Counterterrorism chief declares al-Qaida 'in the past'