ISIS militants launched a wave of pre-dawn attacks in and around the northern Iraqi city of Kirkuk on Friday, killing at least 14 people.

ISIS militants launched a wave of pre-dawn attacks in and around the northern Iraqi city of Kirkuk on Friday, killing at least 14 people and setting off fierce clashes with Kurdish security forces that were still raging after sundown.

The assault appeared aimed at diverting attention from the Iraqi offensive to retake Mosul, and raised fears the extremists could lash out in unpredictable ways as they defend the largest city under their control and their last urban bastion in Iraq.

Multiple explosions rocked Kirkuk, and gunfire rang out around the provincial headquarters, where the fighting was concentrated. Smoke billowed over the city, and the streets were largely deserted out of fear of militant snipers. ISIS said its fighters targeted the provincial headquarters in a claim carried by its Aamaq news agency.

North of the city, three suicide bombers stormed a power plant in the town of Dibis, killing 13 workers, including four Iranian technicians, before blowing themselves up as police arrived, said Maj. Ahmed Kader Ali, the Dibis police chief.

Iran’s Foreign Ministry spokesman, Bahram Ghasemi, condemned the assault, which he said also wounded three Iranian workers, according to the official IRNA news agency. It was not immediately clear if Iranians were targeted in other attacks.

The Turkmeneli TV station, which had earlier shown live footage of smoke rising from outside the provincial headquarters, said in a news bulletin that one of its reporters, Ahmet Haceroglu, was killed by a sniper while covering the fighting.

There was no immediate word on casualties among other civilians or the Kurdish forces in Kirkuk. Police and hospital officials could not be reached for comment.

Kirkuk is some 100 miles (170 kilometers) from the ISIS-held city of Mosul, where Iraqi forces launched a wide-scale offensive on Monday. ISIS has in the past resorted to suicide bombings in and around Baghdad in response to battlefield losses elsewhere in the country.

Kirkuk is an oil-rich city claimed by both Iraq’s central government and the largely autonomous Kurdish region. Kurdish forces assumed full control of the city in the summer of 2014, as Iraq’s army and police crumbled in the face of a lightning advance by ISIS.

Kemal Kerkuki, a senior commander of Kurdish peshmerga forces west of Kirkuk, said the town where his base is located outside the city also came under attack early Friday, but that his forces repelled the assault.

He said ISIS maintains sleeper cells of militants in Kirkuk and surrounding villages. “We arrested one recently and he confessed,” he said, adding that Friday’s attackers may have posed as displaced civilians in order to infiltrate the city. Kirkuk province is home to hundreds of thousands of people displaced by the conflict.

Iraqi and Kurdish forces backed by a US-led coalition launched the multi-pronged assault this week to retake Mosul and surrounding areas — the largest operation undertaken by the Iraqi military since the 2003 US-led invasion.

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