Iraqi officials say a bomb explosion killed at least 67 people in a Shi'ite Muslim neighborhood of Baghdad Thursday. Many more were wounded. Officials say the explosives were in a truck that blew up at the crowded Jameela market in Sadr City.

The Islamic State group said it carried out the attack. The Sunni militant group considers Shi’ites to be heretics. The Iraqi government is fighting alongside Shi'ite militia against the Islamic State group in several provinces. A U.S.-led campaign of airstrikes also is targeting the extremists.