A US-led coalition air strike on the eastern Syrian town of Mayadeen early today killed at least 80 relatives of Islamic State group fighters. A monitoring group told AFP that the toll includes 33 children.<br/><br/>Rami Abdel Rahman, head of the Syrian Observatory for Human Rights said, they are families seeking refuge in the town's municipal building. <br/><br/>Meanwhile, the Syrian army is in full control of the highway from Damascus to ancient Palmyra for the first time since 2014 after driving out terrorists.<br/><br/>Since troops recaptured Palmyra from the Islamic State group in March, the UNESCO World Heritage site had been accessible via Syria's third city Homs, about 150 kilometres to the west.