Omar Hammami
Omar Hammami addresses al-Shabaab fighters in a farm within Afgoye district near Somalia's capital Mogadishu May 11, 2011. Photo by Reuters
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A prominent U.S.-born Islamist militant was killed in Somalia on Thursday, witnesses said, after he fell out with the al Shabaab rebel group's top commander.

Residents in al Baate village in southern Somalia said Alabama-born Omar Hammami, commonly known as Abu Mansoor al-Amriki or 'the American', and a British national known as Usama al-Britani were shot dead in a dawn raid on their hideout.

Hammami's killing exposed the rifts in al Shabaab's top ranks as the group affiliated to al Qaida grapples with an African Union-led military offensive that has captured key cities from the militants, depriving them of revenues.

"This morning al-Amriki and his comrades were attacked by well-armed fighters," said village resident Hussein Nur. "After a brief fight al-Amriki and his two colleagues were killed. Several of their guards escaped."

A shopkeeper from the rebel-controlled village heard al Shabaab fighters confirm the deaths and said the militants had closed off the area where Hammami was gunned down.
Al Shabaab declined to comment.

Hammami, 29, was among senior-ranking commanders who viewed al Shabaab leader Ahmed Godane as veering from the group's goal of imposing their strict interpretation of Islamic sharia law over the country. Hammami and others were sidelined or killed.

In June, al Shabaab's firebrand spiritual leader Sheikh Hassan Dahir Aweys, also caught up in the rift, fled.

"Godane has consolidated power by removing rivals from the group, including ideological and religious leaders," said Emma Gordon, east Africa analyst at IHS Country Risk, adding it made a more cohesive group capable of launching fresh attacks.

Hammami, who is on Washington's Most Wanted Terrorist list, is believed to have arrived in Somalia in late 2006. He swiftly gained influence among rebel foreign jihadists fighting to topple a government seen as a Western puppet.

In a growing campaign to challenge al Shabaab, more than 150 clerics signed a government-supported fatwa, or Islamic ruling, against the group on Wednesday, saying its ideology was a threat to Islam.

The government has tried to undermine ideological support for the militants, who formed an alliance with al Qaida in 2012.

Somalia's embattled central administration is struggling to restore law and order across the country as it emerges from two decades of civil conflict.

A bomb in the port city of Kismayu on Thursday wounded the newly recognized leader of the southern Juba region. Western security sources said the blast had targeted his convoy as it drove through the city.