BEIRUT (Reuters) - Air strikes by U.S.-led forces in Syria have killed 865 people, including 50 civilians, since the start of the campaign in late September against Islamic State militants, a group monitoring the war said on Wednesday. The Britain-based Syrian Observatory for Human Rights said the majority of the deaths, 746, were Islamic State fighters and that the actual figure could be much higher. Islamic State has seized tracts of territory in Syria and neighboring Iraq, where it has also been targeted by U.S.-led forces since July. ...