Iraq conflict: Is Baquba the new jihadist frontline?
17 June 2014 Last updated at 19:25 BST
The militant offensive has reached the outskirts of the city of Baquba - just 60km (37 miles) from the Iraqi capital, Baghdad.
Fighters from ISIS (the Islamic State in Iraq and the Levant) and other armed groups are understood to have attacked some of the suburbs before being pushed back by government forces.
Jonathan Beale reports.