When the Israeli soldiers entered the Gaza school where Yousef Khalil was sleeping near his family, they began shooting indiscriminately, killing nine people including children, he said, pointing to bullet-pocked, bloodstained walls.

His account, which Israel’s military says it is looking into, comes after the killing of three hostages escaping Hamas in Gaza raised new questions over Israel’s rules of engagement in a campaign that has proven unusually deadly for civilians.

According to Khalil, he was sheltering with his family in early December in the Shadia school in the Jabalia refugee camp in northern Gaza where some of the most intense recent fighting has been.

Read the full Reuters story here.