President Donald Trump said US forces conducted "powerful and deadly" strikes Thursday against Islamic State militants in northwestern Nigeria, after he warned the group to stop killing Christians in the country. The Department of Defense said "multiple ISIS terrorists" were killed in an attack conducted at the request of Nigerian authorities, but few details were provided. The strikes hit IS targets on Christmas Day, according to Trump. "I have previously warned these Terrorists that if they did not stop the slaughtering of Christians, there would be hell to pay, and tonight, there was," he said in a post on his Truth Social platform. "May God Bless our Military," he said, adding provocatively, "MERRY CHRISTMAS to all, including the dead Terrorists, of which there will be many more if their slaughter of Christians continues."