The U.N. human rights office said Islamic State militants are increasing mass killings and abductions of civilians to use as human shields as the battle for Mosul in Iraq intensifies. The Office of the High Commissioner for Human Rights said Islamic State militants are continuing to forcibly transfer civilians to the city of Mosul and its outskirts to shield themselves from air strikes. Over the past few days, it said s about 2,500 civilians were abducted from the town of Hamam...