Rocket fire killed four children and a woman Sunday (May 12th) in the regime-held town of Suqaylabiyah in Hama province, and wounded six other children, AFP reported.
The Syrian Observatory for Human Rights said the rockets had been fired from the nearby Idlib region, which is controlled by Tahrir al-Sham.
The Observatory said it was unclear whether the extremist alliance or other opposition groups were behind the attack.
The regime and its allies have upped their deadly bombardment of the edges of the Idlib region in recent weeks, killing dozens and causing tens of thousands to flee, the Observatory said.
They also have taken several towns this week from the extremist alliance near Suqaylabiyah.
UN-linked aid groups have suspended activities in parts of the Idlib region, as the increased violence since late April has jeopardised the safety of humanitarian workers.
The uptick in airstrikes and shelling also has displaced 180,000 people between April 29th and May 9th, according to the UN.