The Islamic State (Isis) has released a gruesome video in which Kurdish-speaking militants of the jihadist group appear to behead three members of the Kurdish peshmerga forces in northern Iraq.

The Kurdish hostages, wearing the Guantanamo-like orange jumpsuit, are executed in three different locations by the black-clad IS fighters, who are speaking Sorani (central Kurdish dialect).

One of the militants is depicted as saying: "To the Muslim Kurdish people: know that our war is not with you, rather it is with those who ventured into an alliance with the Safavids and crusaders to wage war on the Muslims" before engaging in the decapitation with knives. Savafivds is a derogatory terms to refer to Iran.

Another militants addresses Kurdish leader Masoud Barzani: "We warned you before that for every rocket you fire on those under the care of the Islamic State, you will kill one of your prisoners with your own hands".

The video, published just in coincidence for the Kurdish New Year, caused indignation and anger in the Kurdish communities.

Barham Salih, former prime minister of the Iraq's Kurdistan Regional Government (KRG) declared the annual celebration as "Newroz of defiance".

"This should turn people against Daesh. Kurds should unite in support of Peshmerga martyr families and campaign for more effective international assistance to our people," Salih said.

The beheading video comes after IS militants released footage showing 21 Kurdish peshmerga fighters being paraded through the streets of Kirkuk province.

Several men in cages are depicted while being interviewed by an IS militant holding a microphone with the group's insignia. Then, they are driven through cheering crowds of an unspecified city in Iraq's Kirkuk.