BEIRUT- On Tuesday, a war monitor and rebel group spokesman said that airstrikes hit a part of northwest Syria for the first time since a ceasefire was declared 10 days ago.
Syrian government forces and their Russian allies unilaterally agreed on a truce on August 31 in opposition-controlled Idlib, where a "de-escalation zone" was brokered two years ago.
Since August 31 the intense airstrikes by Russian and Syrian warplanes that had accompanied a Syrian government push to re-take the area have stopped, although there has been ground fighting and shelling.
The United States said its forces had carried out strikes against an al-Qaeda facility in Idlib on the day the ceasefire came into effect.
The Syrian Observatory for Human Rights war monitor, based in Britain, said planes had carried out two raids on in the strategic Jabal al-Akrad mountain range near the western Latakia coast.