A suspected Al Qaeda in Iraq fighter believed responsible for the assassination of a U.S.-allied Sunni tribal leader in Anbar province was arrested north of Baghdad, the military said Sunday. Fallah Khalifa Hiyas Fayyas al-Jumayli, an Iraqi also known as Abu Khamis, was seized Saturday in a raid west of Balad after intelligence reports linked him to the killing of Sheik Abdul-Sattar Abu Risha, the military said. He was not believed to be acting alone and the search continued for other suspects, military spokesman Rear. Adm. Mark Fox said.