At least 18 civilians are reported to have died in air strikes that hit a market and an industrial zone in the Syrian rebel-held city of Idlib.
A monitoring group said Russian and Syrian government planes carried out the attacks.
The air strikes happened despite a ceasefire brokered earlier this month by Russia and Turkey.
Idlib is the capital of the north-west province of the same name and is the last stronghold of rebel groups.
Neither the Syrian government nor its Russian allies have so far commented on the latest air strikes.
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