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. Displaced people are said to have been sheltering inside the building. The Israeli army said that it had targeted a Hamas command centre allegedly embedded inside the building. Israeli forces had taken extensive measures to mitigate the risks for civilians ahead of the attack, it said. The Hamas fighters targeted were responsible for targeting attacks on Israel, i…