GENEVA - The Syrian government and Islamic State insurgents are both committing war crimes and crimes against humanity in their war against each other, UN investigators said on Wednesday.

Islamic State forces in northern Syria are waging a campaign to instil fear, including amputations, public executions and whippings, they said.

Government forces have dropped barrel bombs on civilian areas, including some believed to contain the chemical agent chlorine in eight incidents in April, and have committed other war crimes that should be prosecuted, they said in a 45-page report issued in Geneva.

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