BEIRUT (Reuters) - At least 21 people were killed and around 100 wounded overnight when Syrian army planes bombed a town in **rthern Syria that is controlled by Islamic State militants, a group monitoring the war said. Syrian military helicopters dropped barrel bombs and warplanes launched air strikes on al-Bab which lies **rtheast of the city of Aleppo, the Britain-based Syrian Observatory for Human Rights said on Sunday. ...