BAGHDAD - A suicide bomb and mortar attack by Islamic State militants killed 12 Shi'ite militia fighters north of Baghdad on Wednesday and a series of bombings in the Iraqi capital killed six people, military and medical sources said.
The militia fighters were killed when Islamic State militants commandeered an armored Humvee, rigged it with explosives and drove it into a school where the fighters were based near Dijla district, 20 km (15 miles) south of the city of Samarra.
They followed up with mortar and machine gun fire, a source at the Samarra Operations Command said, and clashes continued.
Radical Sunni Islamic State fighters, who control much of north and west Iraq, are battling the army, Kurdish peshmerga forces and Shi'ite militias allied to the Shi'ite-led government in Baghdad, which is also supported by U.S.-led air power.
Islamic State have lost some ground since they swept through northern Iraq towards Baghdad in June, but they continue to hold swathes of territory and carry out attacks on many fronts.
A local commander said several militants were killed in Iraqi air strikes on Wednesday against an Islamic State target near the town of Muqdadiya, north of Baghdad.