BAGHDAD (AP) — Iraqi officials say the death toll from a late night suicide attack targeting a police checkpoint in Baghdad has climbed to 31 people, most of them civilians.

The bomber had rammed his explosives-packed car into a checkpoint in Baghdad's northern neighborhood of Kazimiyah where people lined up in cars for security checks en route to a revered Shiite shrine during the Islamic holy month of Ramadan.

Police officials said Wednesday that along with 31 killed, the explosion also left at least 58 people wounded. Initial reports had 21 killed. The officials spoke on condition of anonymity as they are not authorized to talk to media.

Baghdad has been on edge since the Sunni militant blitz led by the Islamic State extremist group seized large swaths of northern and western Iraq.