ISIS attacks Iraq's largest refinery in Baiji with mortars, gunfire

``ISIS militants have launched an attack on Iraq's largest oil refinery with mortars and machine gun fire, refinery employees say. The extremist group has been gaining ground in Iraq, seizing control of territory in its mission to create an Islamic state... The refinery is the largest in Iraq and processes 300,000 barrels a day, providing oil for most of the northern region of the country.''