U.S. admits to possible accidental bombing of Syrian troops

Islamic State of Iraq and Syria (ISIS) shot down a Syrian warplane on Sunday as regime forces regained ground lost to the extremists following a U.S.-led airstrike that hit government forces the day before, state media said.The U.S. military says it may have unintentionally struck Syrian troops while carrying out a raid against ISIS on Saturday. The incident has threatened an already fragile U.S. and Russian-brokered cease-fire that has largely held in the five-year-old Syria war​ despite