Australian agencies believe that the online message inciting followers of the Islamic State of Iraq and the Levant (ISIL) to kill Australians is genuine and poses a threat to international security, the nation's Foreign Minister Julie Bishop said on Tuesday.

The message also targets any citizen of the countries involved in the international coalition designed to tackle the Islamist group that has overrun territories in Syria and Iraq.

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ISIL has reportedly declared war against the West with the first official statement issued by Abu Muhammad al-Adnani ash-Shami, the terror group's spokesman. Al-Adnani's speech was uploaded online days after the Australian government authorized a massive counter-terrorism raid in Sydney and Brisbane last week.

The operation foiled a planned demonstration killing of a random Australian whose beheading video was to be released online. It also led to the arrest of 15 suspected terrorists, with one already charged of plotting terrorism on Australian soil.

In the speech, al-Adnani urged Islamic State fighters to kill Western infidels - Americans, Europeans, Australians, Canadians, French - whom the Islamist group recently labelled as "spiteful and filthy," the Telegraph reported.

Al-Adnani also included all infidels who oppose the Islamic State as targets, saying that they should be killed in any way possible.

Bishop, who is in New York for the UN Security Council talks on the crisis in the Middle East later this week, said the terror group is prepared to fight back anyone who does not share its harsh Islamist ideologies.

Bishop told ABC News that Westerners are hated by the group not because they are a threat to the terror group, but because of who they are.

Additionally, Bishop said ISIL makes no distinction between ethnicity, religion and race. For this reason, Australia is committed to supporting the U.S.-led international coalition that vows to degrade and destroy the terror group.

TagsISIS, ISIL, anti-ISIS coalition