Airstrikes on two markets killed up to 50 people in northwest Syria on Tuesday, as Syrian government forces backed by Russian air power also launched strikes against rebels in the province of Latakia, a rebel group and a conflict monitor said.

Targets included towns and villages where a partial truce agreement had brought about a lull in fighting between the government and rebels since Feb. 27. That agreement has unraveled in recent weeks.

In the insurgent stronghold of Idlib province, which neighbors Latakia, airstrikes on a vegetable market in the town of Maarat al-Numan killed around 40 people and injured dozens, the monitor, rescue worker and opposition source said.