Iraqi

The US-led coalition has acknowledged hitting a vehicle carrying explosives in the March 17 strike -- though US officials have not confirmed the Iraqi military's account of exactly what happened.

Confusion has surrounded events during airstrikes on the city between March 17 and 23 after allegations emerged that as many as 200 civilians had been killed there.

The most deadly was caused by a car bomb in the mainly Shia Sadr City area.

The same district was hit by a massive truck bomb two days ago that killed more than 60 people and was claimed by Islamic State militants.

Sadr City has been the target of several bomb attacks this year claimed by IS who consider Shia to be heretics.

No claim

Saturday's attack targeted a vehicle market in the Habibiya area of Sadr City which had been targeted multiple times in the past, AP news agency said.

Fifteen people were killed and a further 35 injured, officials said.