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ISIS has declared war on Saudi Arabia, after the Middle East's wealthiest nation claimed to have formed a 34-bloc military task force aimed at destroying the cult.

A gruesome new execution video purportedly released by ISIS today features various jihadists accusing the Arab state of joining a coalition with "crusaders".

Over images of galloping horses interspersed with brutal killings and gunfights, soldiers repeatedly call for Saudi Arabia to come and fight them in Syria.

The end of the clip shows a man in a blue jumpsuit - alleged to be a Saudi 'collaborator" - being shot in the face.

The video comes after Saudi Arabia announced it had brokered the formation of a 34-state Islamic military coalition to combat terrorism.

Arab countries said to be involved include Egypt, Qatar, the United Arab Emirates, Lebanon, Turkey, Malaysia, Pakistan and Gulf Arab and African states.

A statement read: "The countries here mentioned have decided on the formation of a military alliance led by Saudi Arabia to fight terrorism, with a joint operations centre based in Riyadh to coordinate and support military operations."

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However, some of the countries included on Saudi Arabia's list have expressed surprise at their inclusion.

Lebanon's foreign minister denied any knowledge of an anti-terror coalition, the Lebanon Daily Star reported.

And the Rakyat Post reported Malaysia's defence minister saying his country was in "the same fight" as Saudi Arabia against ISIS, but it was done seperately.