Syria's government is being accused of using barrel bombs packed with explosives and shrapnel in its airstrikes on Idlib.
Children are among those believed to have been killed.
President Bashar Al Assad's forces, backed by Russia, are carrying out airstrikes on the rebel-held province.
The Syrian Army denies using barrel bombs, which are illegal under international law, but United Nations investigators have extensively documented their use there.
Millions of people live in Idlib and the UN is warning of a humanitarian catastrophe if a ceasefire isn't reached.
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