Palestinians said the school was sheltering displaced people but the Israeli army said it was being used as a command center by Hamas.

Palestinian authorities say 15 people were killed overnight in the Gaza Strip in multiple Israeli attacks. An airstrike early Friday morning in Gaza City hit a family home, killing six people including an unknown number of children, Gaza’s Civil Defense said. Another person was killed in Gaza City when a strike hit a group of people on a street.

At least 22 people were killed in an Israeli attack on a former school building in Gaza City, Palestinian authorities said on Saturday. At least 30 people were injured, including women and children, the health authority in Gaza said.