The US government is “deeply concerned” about the Israeli strike on a Gaza City school on Saturday which Palestinian authorities said killed up to 100 people, a National Security Council spokesman has said. “We are in touch with our Israeli counterparts, who have said they targeted senior Hamas officials, and we are asking for further details,” the spokesman said. Israel earlier said the building it hit in Gaza City “served as a hideout for Hamas terrorists and commanders.” The US spokesman said the Palestinian militant group Hamas was known to be “using schools as locations to gather and oper…