The IS has captured the hydroelectric dam on the Tigris River, which provides northern Iraq with power and is the largest in the country. Its failure could send a 65-foot wave across large areas of Iraq including a flood one meter deep in Baghdad.
Also Thursday, Islamists overran 14 towns with Christian majorities in northern Iraq, putting tens of thousands to flight with an ultimatum: Convert to Islam or die. Church leaders have appealed for immediate help.