U.S. behind strike that killed Nusra Front's Abu Firas - officials

The United States has carried out an air strike in Syria that killed a prominent leader of al Qaeda offshoot Nusra Front, Abu Firas al-Suri, U.S. officials told Reuters on Monday. Islamist rebel sources said Abu Firas, who was a former Syrian army officer discharged in the late 1970s because of his Islamist leanings, was a founding member of the militant group and had fought in Afghanistan in the 1980s.