Nine fighters from a Shi’ite Muslim militia battling Islamic State were killed in northern Iraq when an Iraqi army aircraft fired at them in error, security and militia sources said on Sunday.

The fighters were responding to an Islamic State attack west of Camp Speicher, a former U.S. base outside the city of Tikrit, said Ahmed al-Assadi, spokesman for the Hashid Shaabi, a coalition of mostly Shi’ite militias fighting the militants alongside Iraq’s military.

More than a dozen fighters were wounded, he said.

Colonel Mohammed al-Assadi, spokesman for the joint police and military operations command in Salahuddin province, said that at 10:30 pm (1930 GMT) on Saturday, an Iraqi army aviation drone opened fire due to mistaken coordinates. […]