Warplanes bombarded a Palestinian refugee camp in southern Damascus on Sunday for the first time since the start of Syria’s more than 21-month conflict, the Syrian Observatory for Human Rights said.

The air strike on Yarmuk was the sixth on Sunday on flashpoint districts in southern Damascus, the Britain-based watchdog said.

Warplanes also bombarded the nearby districts of Al-Hajar al-Aswad and Assali, scene of intense fighting between troops and rebels, it added.