U.S. war planes killed an Islamist rebel said to be al Qaeda's leader in Somalia and at least a dozen other people on Thursday in Washington's biggest blow against an insurgency raging since 2007. The rebels said Aden Hashi Ayro -- who led al Shabaab militants blamed for attacks on government troops and their Ethiopian allies -- died in the first major success for a string of U.S. air-strikes on Somali insurgents in the last year. "Infidel planes bombed Dusamareb," Shabaab spokesman Mukhtar Ali Robow told Reuters by phone, referring to a town in central Somalia, where body parts lay...