Britain-based war monitoring group the Syrian Observatory for Human Rights, along with the National Defense Forces (NDF) militia in southern Syria reported that a military base in Quneitra province was attacked on Sunday.

It remained unclear whether the bombardment came from an air strike or shelling, the British watchdog said, adding that it had struck a "weapons warehouse" in the camp.

Three members of the pro-government NDF were reportedly killed while two were wounded; an unnamed militia official was quoted as saying by news agency AFP.