UN war crimes investigators said they were probing a suspected poison gas attack that killed more than 50 people in a rebel-held area of northern Syria on Tuesday.
The White Helmets, a rescue group that operates in rebel areas, said that about 250 people were suffering from choking symptoms caused by an unknown gas after a government air strike hit the town of Khan Sheikhoun in Idlib province.
The Syrian Observatory for Human Rights, a UK-based monitoring group, said that the strike had killed at least 58 people, including 11 children.
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