BAGHDAD (AFP) - The Islamic State in Iraq and Syria (ISIS) group released a video on Saturday purporting to show a French-speaking militant threatening attacks against the West and executing so-called apostates and spies in Iraq.

The footage, posted on extremist websites, is said to have been produced by the ISIS media office in Iraq's Nineveh province, and shows young men testifying to have acted against the militants before being shot dead execution style.

The French-speaker wears a beige mask and military fatigues and carries a handgun.

Curls of blond hair can be seen below his mask.

The video appears to have been made after the Nov 13 Paris attacks that killed 130 people and were claimed by ISIS.

The French-speaking man brands the US-led coalition fighting ISIS in Syria and Iraq "imbecile miscreants" and warns that they will be unable to crush the terrorist group.

He vows that ISIS will carry out acts that will make the West forget the Sept 11, 2001, attacks against the United States that killed nearly 3,000 people, or the Paris carnage.

He also vows that the West, particularly Spain, will "pay dearly" for having crushed Muslim rule in ancient Andalusia, in southern spain where the Moors ruled from 711 AD to 1492.

He speaks of Cordoba and Toledo and says the ancient land of Andalusia is Muslim and has not been forgotten.

At the end of the almost eight-minute video, the French-speaker and other ISIS fighters shoot dead five kneeling men in orange jumpsuits.

The "execution" appears to take place in the ruins of a building which destroyed in an air strike.