Russian warplanes fired missiles at a training camp run by a US-backed rebel group in the northwest Syrian province of Idlib on Thursday, the group's spokesman told AFP.

"At exactly 10:30am (0730 GMT), Russian planes targeted Suqur al-Jabal's training camp, with four Russian planes firing more than 10 missiles," said Mustafa Halabi, spokesman for Suqur al-Jabal (Falcons of the Mountain). 

He said two more Russian warplanes attacked the base at noon local time, but that no rebels were hit.