The Islamic State has reportedly called for a holy war against the United States and Russia, Reuters reported Tuesday afternoon.

The alleged threat came in an audio clip distributed by their supporters Tuesday, Reuters reported, though the file was not immediately available on the Web.

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“Islamic youth everywhere, ignite jihad against the Russians and the Americans in their crusaders' war against Muslims,” Islamic State spokesman Abu Mohammad al-Adnani is reportedly heard saying.

The United States and Russia are carrying out airstrikes in Syria, which they say are targeting the Islamic State.

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No further information was available. Stay with Metro as this story develops.

Reuters contributed to this report.