A U.S. airstrike in Syria appears to have killed a key French jihadist who is part of the militant Khorasan Group, a U.S. defense official said Thursday. The strike happened overnight Wednesday near Idlib, according to the official, who has access to the latest information about the strikes. The U.S. fired at a vehicle it believes carried David Drugeon, a skilled bomb-maker in his 20s who also has ties to core al Qaeda members in Pakistan. The Khorasan Group is made up of senior al Qaeda leaders who have moved into Syria. The United States targeted the Khorasan Group with...