PKK-HPG commander tells BBC: We are much better experienced than the Islamic State by guneyyildiz

In the last week we've been reporting how the Iraqi-Kurdish peshmerga militia in northern Iraq have struggled to hold ground in the face of the attacks by Islamic State. But reinforcements have arrived in the form of other Kurdish fighters from across the border, the PKK..

BBC Newshour's Guney Yildiz has been speaking to Tekoşer Zağros the PKK commander who is in charge of their forces fighting against Islamic State in the town of Makhmour.

We'll hear that in a minute but first who are the PKK.