BEIRUT (Reuters) - Islamic State fighters shot down a Syrian war plane using anti-aircraft guns on Tuesday, the first time the group has downed a military jet since declaring its cross-border caliphate in June, a group monitoring the civil war said. The plane came down outside Islamic State's stronghold of Raqqa city, 400 km (250 miles) **rtheast of Damascus, during air strikes on territory controlled by the group, a resident said. ...