BAGHDAD — Iraq’s prime minister on Monday ordered an investigation into violations of human rights and other abuses purportedly committed by government troops and paramilitary forces battling the Islamic State group to retake the city of Mosul. The statement also said the abuses were recorded and then posted on social media to “spoil the joy of victory and to defame the real image of the brave security forces and their sacrifices to liberate the land and to maintain security.” Al-Abadi’s statement came days after the U.N.