Alalam - Iraq
The attack, which took place on Thursday night at a gas station on a major highway near the city of Hilla, about 95 kilometers (60 miles) south of the Iraqi capital.
ISIS claimed the attack in a brief statement on its Aamaq media arm, saying it was a suicide truck bomb.
The attack appears to have targeted a bus with Iranian pilgrims heading home after a major Shiite religious observance called Arbaeen in the holy city of Karbala.
The attack was the deadliest by IS since a massive car bomb killed around 300 people in Baghdad in July.
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