ISIS militants attacked Iraqi city
Kirkuk is 175 kilometers southeast of Iraq's second-largest city of Mosul, Aljazeera.
Militants armed with assault rifles and explosives attacked targets in and around the northern Iraqi city of Kirkuk early on Friday in an assault quickly claimed by the Islamic State group.
A number of buildings and a power station have been attacked, according to security sources and local media.
In one of Friday's attacks, at least three suicide bombers were killed as security forces foiled an attack on a former police complex in central Kirkuk.
Separately, at least six members of the security forces were killed along with two Iranian nationals who were part of a team carrying out maintenance in a power station outside Kirkuk, a hospital source told Reuters news agency.
The Islamic State of Iraq and the Levant (ISIL, also known as ISIS) group claimed the attacks in online statements.