An airstrike on the rebel-held Syrian city Idlib has killed at least 25 people, including a number of children, according to reports.
Warplanes attacked a busy market place with suggestions that up to 80 people had been injured, Middle East Eye said.
Two civil defence workers said bodies were still being pulled out of the rubble of collapsed buildings in the area, so the death toll may continue to rise.
One resident and rescue worker said the high altitude of the jet would indicate the attacker was most likely a Russian plane, as Syrian helicopters fly much lower.
This claim had not been independently verified.
The attack comes only hours after the US and Russia announced a landmark peace deal.
The two superpowers announced an agreement that included a ceasefire from sundown on Monday.
In recent weeks a series of bombings on villages in the province run by a coalition of Islamist brigades have increased, leaving dozens dead and injured, according to local residents.
Additional reporting from Reuters
