The UN human rights office says civilian deaths in Gaza during the Israeli operation to release four captives could amount to war crimes.

“We are profoundly shocked at the impact on civilians of the Israeli forces’ operation. Hundreds of Palestinians, many of them civilians, were reportedly killed and injured,” said Jeremy Laurence, spokesperson for the UN human rights office.

At least 274 people, including at least 64 children, were killed during the Israeli raid on the Nuseirat refugee camp in central Gaza last week.