At least 22 civilians including a child were killed in air strikes on an Al-Qaeda-held town in northwest Syria on Friday, a monitoring group said. 

Dozens of people were also wounded in the strikes on Darkush, near the Turkish border, the Syrian Observatory for Human Rights said, updating an earlier casualty toll.

"The toll of the attack is now 22 people, including a child and seven women," said Observatory head Rami Abdel Rahman. 

Darkush is held by Al-Qaeda affiliate Al-Nusra Front and allied rebel groups, which control the northwestern province of Idlib. 

A Facebook page run by activists in the town posted photographs showing a column of grey smoke curling out of a town tucked in verdant hills. 

It said some of the wounded had been transferred to nearby hospitals, and others across the border inside Turkey. 

The Britain-based Observatory had no immediate word on who carried out the strikes but said it was likely to have been either the Syrian government or its ally Russia, rather than the US-led coalition.

Russia launched air strikes in support of the Damascus regime in September, one year after the international coalition bombing the Islamic State (IS) group in Iraq extended its raids to Syria.

The Syrian army announced on Wednesday it would observe a 72-hour nationwide ceasefire for Eid al-Fitr, the feast marking the end of the Islamic holy month of Ramadan.

It was unclear if Al-Nusra was included, but the Al-Qaeda affiliate and its jihadist rival, IS, were excluded from a broader truce brokered by Moscow and Washington in February.

The Kremlin said on Wednesday that President Vladimir Putin and his US counterpart Barack Obama had agreed to "intensify" military coordination in Syria. 

The White House said the two leaders had "confirmed their commitment to defeating ISIL (IS) and the Al-Nusra Front".

Last month, air strikes on the provincial capital Idlib city killed at least 21 civilians, including five children.

The Observatory, which relies on a network of sources inside Syria for its information, says it determines what aircraft carried out raids based on their location, flight patterns and the types of planes and munitions involved.

More than 280,000 people have been killed in Syria since the country's civil war erupted in 2011, starting with peaceful protests that swiftly escalated into an armed rebellion increasingly dominated by jihadist groups.

Source: AFP