REUTERS

"Islamic youth everywhere, ignite jihad against the Russians and the Americans in their crusaders' war against Muslims," the speech by Islamic State spokesman Abu Mohammad al-Adnani said, Reuters wrote.

The audio message also confirmed the death of Abu Mutaz Qurashi, which the SITE monitoring service said was a reference to a senior Islamic State official killed in an airstrike in Iraq in August and referred to then as Fadhil Ahmad al-Hayali.

The United States and Russia are carrying separate airstrike campaigns in Syria, which they say are targeting Islamic State.

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Washington says Moscow's campaign has mainly targeted other insurgent groups including those that have fought Islamic State, a charge Russia denies.