Boys as young as six call for caliphate in footage filmed in Lakemba

Video has emerged of boys as young as six chanting extremist Islamic views and vowing to fight to the death at a youth group meeting in Sydney's southwest.

The video obtained by Seven News shows four boys performing on a stage as "Soldiers of Khilafa", or soldiers of the caliphate, waving flags and chanting for the head of Syrian President Bashar al-Assad, the Sydney Morning Herald reports.

One six-year-old boy takes the microphone and declares, "You're never too young to be a soldier for Khilafa".

The children, the eldest said to be aged 13, promise to die fighting to end democracy in Australia so that it can be replaced with Islamic rule.

According to Seven, the footage was filmed at a meeting of the Muslim Youth Project in Lakemba in September last year.

The Sydney Morning Herald reports another meeting is scheduled to take place this weekend.

Immigration Minister Scott Morrison described the video as "ugly" and "disturbing", vowing to track down those responsible.

"It's one thing for these peddlers of vicious hate to do that themselves, which is appalling enough, but to recruit children into such a sickening display I think appals all Australians of all religions, rightly," he told Seven.

It is believed one of the men pictured leading the chant is Bilal Merhi, a senior figure of radical group Hizb ut-Tahrir.

NSW Community Services Minister Gabrielle Upton confirmed police are investigating the footage.