Bombardment killed 13 civilians in northwest Syria on Sunday, the large majority in regime fire on areas of the jihadist-held Idlib region, a war monitor said. The violence was the latest to threaten a seven-month-old truce intended to stave off a regime offensive on the region held by Syria's former Al-Qaeda affiliate. Sunday's shelling and rocket fire by regime forces killed nine civilians in several areas of Idlib, the Syrian Observatory for Human Rights said.