Evidence mounts that British Islamic State leader killed in air strike

By John Davison and Mariam Karouny BEIRUT (Reuters) - The United States targeted British Islamic State leader "Jihadi John" in an air strike in northern Syria and evidence was growing on Friday that he was killed. A U.S. official said Thursday's attack in the town of Raqqa probably killed Mohammed Emwazi, a British citizen who was nicknamed "Jihadi John" after appearing in videos showing the killings of American and British hostages. The Syrian Observatory for Human Rights, a monitoring group, s