BAGHDAD (AP) — A suicide bomber on Sunday rammed his explosives-laden fuel truck into a security checkpoint south of Baghdad, killing at least 31 people and wounding dozens, officials said, the latest episode in an uptick in violence in the war-ravaged country.

Among the dead were 24 civilians, while the rest were members of the security forces. The attacker struck shortly after noon when the checkpoint at one of the entrances to the city of Hillah was crowded with dozens of cars, a police officer said.

He added that up to 55 other people were wounded and more than 20 cars were damaged. Hillah is located about 95 kilometers (60 miles) south of Baghdad.

A medical official confirmed the causality figures. Both officials spoke on condition of anonymity as they were not authorized to release information.

Iraq has seen a spike in violence in the past month with suicide attacks in and outside Baghdad killing more than 100 people.

No one immediately claimed responsibility for the attack, which bore the hallmarks of the Islamic State group. IS and other Sunni militants frequently use car bombs and suicide attacks to target public areas and government buildings in their bid to undermine confidence in the Shiite-led government in Baghdad.

Associated Press writer Murtada Faraj contributed to this report.