At least seven people including three Iranians were killed today in twin gun and auto bomb attacks in southern Iraq, officials said.
In the first attack, gunmen stormed a roadside restaurant near Nasiriyah, the capital of Dhiqar province, and opened fire, a spokesman for the Iraqi interior ministry said.
Officials fear that the final death toll could rise, as many of those injured in the attacks are in serious critical condition.
Officials said the first attack struck close to a restaurant while shortly afterwards a auto bomb targeted a security checkpoint in the same area. The attacks occurred on a highway regularly used by pilgrims and visitors from neighbouring Iran, en route to holy cities of shia of Najaf and Karbala, to north.
In a statement released by its propaganda arm Amaq, IS said several suicide bombers had staged the assault on a restaurant and a security checkpoint.
Iraqi and Kurdish security officials told Reuters the Sunni militants were likely to wage a guerrilla war in Iraq after devastating territorial losses they suffered from Iraqi forces.
Thursday's attacks come as Iraqi forces backed by tribal fighters closed in one of the last Daesh bastions in the country: Al Qaim area on the border with war-ravaged Syria.
The toll makes it the deadliest Daesh attack in Iraq since pro-government forces drove the extremists out of second city Mosul in July.