BAGHDAD — An Islamic State suicide bomber struck a wedding south of Baghdad on Monday, killing at least 15 people and wounding more than a dozen, an Iraqi security official said.

Lt. Gen. Qais al-Mohammedawi said five suicide bombers took part in the attack in the village of Ein Tamr, but that the other four were killed by security forces.

He said they were members of IS, which has stepped up attacks on security forces and the country’s Shiite majority in recent months as it has suffered a string of battlefield setbacks.

The IS-linked Aamaq news agency said four IS fighters carried out the attack, leaving dozens dead or wounded.

Ein Tamr is about 40 kilometers (25 miles) west of the Shiite holy city of Karbala.