Action extremists in Iraqi city of Kirkuk

Armed extremists on Friday attacked government buildings in the Iraqi city of Kirkuk, the BBC reports.

The group Islamic State said to be behind the attack. The IS-fighters would have invaded include City Hall and have occupied a hotel.

Authorities in Kirkuk have imposed a curfew.

The attack in Kirkuk coincided with an offensive by Iraqi government forces and Kurdish militias to liberate occupied by IS city of Mosul in northern Iraq.