At least 21 killed in air strikes on rebel-held Idlib

At least 21 people have reportedly been killed in air strikes on a market in the northern Syrian city of Idlib.

It was not clear who carried out Sunday's raids on the city, the Syrian Observatory for Human Rights said, which reported the number killed.

Idlib is controlled by a coalition of rebel groups, including the al-Qaeda affiliate Al-Nusra Front and Ahrar al-Sham.

The air strikes came a day after a double bomb attack outside a Shia shrine near Damascus killed at least 20 people, a monitoring group said. The official SANA news agency said a suicide bomber and a car bomb struck at the entrance to the Sayyida Zeinab shrine, which is revered by Shias around the world.

The Syrian Observatory for Human Rights, a British-based monitoring group that relies on reports from sources in Syria and the region, said at least 20 people were killed and more than 30 wounded in the blasts.

SANA gave a toll of at least 12 dead and 55 wounded.

The shrine, around 10 km south of the centre of Damascus, is heavily guarded by pro-government forces but has been the target of several militant attacks, including those claimed by the Islamic State (IS) group.

IS claimed Saturday's attack via its Amaq news agency, saying they were carried out by three suicide bombers.

At least 280,000 people have been killed and millions displaced since the Syria war started with the brutal repression of anti-government protests in 2011.