Turkey-backed Syrian rebels clash with army in north

By Tom Perry and Humeyra PamukBEIRUT/ISTANBUL (Reuters) - Turkey-backed Syrian rebel groups clashed with government forces near a city in northern Syria that the rebels recently captured from Islamic State, sources on both sides said, the second such confrontation in the region this month.The fighting late on Sunday took place in an area where the sides are waging separate campaigns against Islamic State.Russia, which backs the Syrian government, mediated to bring an end to the confrontation, ac