A suicide attacker detonated an explosives-rigged vehicle near a crowded security checkpoint in Iraq's Diyala Province on July 25, killing at least 11 people, officials said.
The blast at the entrance to Khales city, north-east of the capital, Baghdad, also wounded at least 30 people, local authorities said.
There was no immediate claim of responsibility for the attack, but the Islamic State (IS) terrorist group carries out frequent suicide bombings in Iraq.
The blast came a day after a suicide bomber blew himself up in a mostly Shi'ite area of Baghdad, killing at least 15 in a series of attacks targeting Iraq's Shi'a community.
IS has recently been losing ground to Iraqi forces who are conducting operations to set the stage for the battle to recapture Mosul, the last IS-held city in the country.
The militant group has responded to the battlefield setbacks by launching suicide attacks -- mostly on civilian targets -- in Baghdad and other cities.