A US Islamic extremist fighting in Somalia was killed Thursday in a shootout with Al-Qaeda linked Shebab militants, former comrades he had fallen out with, witnesses said. Alabama-born Omar Hamami -- better known as Al-Amriki or \"the American\" -- was one of the most prominent foreigners fighting in Somalia, and the US State Department had offered a $5 million bounty for his capture. \"There was a gun battle between Amriki and his men and other fighters, the reports are that Amriki is among those killed,\" said Moalim Ali, a resident in Bardhere district.