>> Syrian rebel groups backed by Turkey say that for the second time in weeks they've clashed with government forces, threatening to derail fragile peace talks in Geneva and campaigns by both sides against Islamic State. A statement from the Free Syrian Army, a confederacy of rebel groups says the fighting took place on Sunday near the city of al-Bab which was captured from Islamic State last week.
It wasn't immediately clear it Turkish soldiers who were involved in the fighting on Sunday. But their special forces and armored vehicles seen here have been known to operate in close proximity to the rebels.
fragile truce has been in place between Damascus and the rebels since December, while they conduct separate operations against Islamic State.
But the cease-fire's success has been repeatedly violated by both sides. This video was said to show warplanes bombing rebel territory in Homs on the same day as the clashes in al-Bab over 100 miles away. Russia backs the Syrian government and intervened in a previous clash three weeks ago.
More pressure for negotiators, trying to bring an end to six years of violence. The two sides trading blame on Sunday, appearing no closer to actual discussion.