Two Somali radio journalists were killed within hours of each other Saturday in this violent capital, witnesses and an official said. Mahad Ahmed Elmi, 30, was shot by two men with pistols as he went to his office at HornAfrik Media Company early Saturday, witnesses said. Ali Iman Sharmarke, owner of HornAfrik Media Company, was killed by a land mine as he returned from Elmi's burial, said another HornAfrik official, Farah Berey, according to a report of the Associated Press.