Jaber al-Helo, Associated Press
Family members of Majeed Abdullah, 31, who was killed in a bombing on Tuesday, load his flag-draped coffin onto a vehicle before his burial in the Shiite holy city of Najaf, 100 miles (160 kilometers) south of Baghdad, Iraq, Wednesday, May 14, 2014. Militants unleashed a wave of car bombings in Baghdad on Tuesday, killing dozens and sending thick, black smoke into the air in a show of force meant to intimidate Iraq’s majority Shiites as they marked what is meant to be a joyous holiday for their sect.

BAGHDAD — Authorities in Iraq say attacks targeting security forces have killed 13 people across the country.

Police officials say the deadliest of Wednesday's attacks happened when gunmen in two cars opened fire on a police checkpoint in the town of Adeim, killing eight police officers and wounding three.

Adeim is about 100 kilometers (60 miles) north of Baghdad.

Police say a roadside bomb blast that missed a military convoy killed three civilians in a town just south of Baghdad.

In Anbar province, police say a suicide bomber rammed his explosive-laden car into a police station's gate in the town of Hit, killing two police officers and wounding three.

Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity as they were not authorized to speak to journalists.