A man with a gun
Media playback is unsupported on your device
Video

Iraq conflict: Kurdish fighting back in Iraq

US forces have carried out a fourth round of air strikes in Iraq, targeting Islamic State militants.

The strikes concentrated around the Kurdish controlled city of Irbil, where thousands of Christians have taken refuge.

The BBC's Caroline Wyatt reports from the battle lines west of the city.

Go to next video: 'Disaster of amazing proportions'