Syrian govt troops mass in northwest after gains

Syrian government forces massed Saturday in northwest Syria in an apparent bid to press an offensive against jihadists and allied rebels that has heightened tensions with neighbouring Turkey.The Syrian military has since Wednesday seized the key town of Khan Sheikhun from jihadists and allied rebels and overran the countryside to the south, encircling a Turkish observation post in northern Hama.In Khan Sheikhun, smoke still curled into the sky from multiple locations on Saturday among buildings