A group armed with explosives and guns killed 11 people in eastern Iraq, security officials said Friday.

The attack took place Thursday night in the area of Muqdadiyah in Diyala province. A roadside bomb exploded and gunmen then opened fire on rescuers and bystanders at the scene, two security officials said. They spoke on condition of anonymity because they were not authorized to speak to the media.

The victims were all civilians, the officials said.

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The gunmen fled and no group immediately claimed responsibility for the attack.

Diyala province has seen periodic attacks by Islamic State cells and sporadic violence due to sectarian tensions between Shiites and Sunnis, as well as fighting between rival militias and their tribal and political allies struggling over influence and lucrative racketeering networks.

This is a locator map for Iraq with its capital, Baghdad. (AP Photo)

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The province, which borders both Iran and Iraq’s autonomous Kurdish region, is a prime conduit for smuggling.

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The Iraqi military’s joint operations command said in a statement that it would form a committee to investigate the attack. Lt. Gen. Qais al-Muhammadawi, deputy commander of the joint operations, traveled to Diyala on Friday to attend a funeral for the victims and and “determine the circumstances of the incident,” the statement said.

The provincial governor of Diyala, Muthanna al-Tamimi, vowed in a statement to “pursue the perpetrators of the terrorist attack.”

Nechirvan Barzani, president of the Kurdish region to the north, said the attack “proves the fact that terrorism still poses a real threat and challenge, and that we must confront them with all our force and ability.”

He called for greater cooperation between the Iraqi army, Kurdish peshmerga forces and other security forces, as well as with the U.S.-led international coalition against IS.