Isil's assault on Hassakeh has begun a new wave of displacement - a video and photographs posted by the Syrian Observatory for Human Rights appears to show families leaving the city on foot, their possessions crammed into rucksacks and plastic bags. The city and its surrounding governorate has played host to waves of refugees from elsewhere, particularly from the deeply persecuted Yazidi community. The conflicts in Syria and Iraq alone have forced an estimated 15 million people to flee their homes.