Video footage surfaced in Australia last week showing boys as young as 6 chanting extremist slogans and calling for the establishment of a worldwide caliphate. Equally as shocking as the ages of the children was the fact that it happened in downtown Sydney.

The footage shows young boys waving black Islamic State flags and chanting to a large gathering of Muslims, while men on either side of the children stir up the crowd. The white-clad children stand out in stark contrast to the large black flags and black-clad clerics. The children are a stark reminder that Australia’s multiculturalism is breeding homegrown terrorists.

At one point in the video, the smallest child on stage steps forward and proclaims, “You’re never too young to be a soldier of Khilafa.” In other words, you are never too young to be a terrorist ready to fight to establish a caliphate. For the Arabic men hosting the event, this means there is no age limit on training children to be extremists.

The video, from September 2013, highlights the fundamental problem the Australian government—and all Western governments—faces when dealing with the threat of terrorism. These children, although born and raised in a tolerant and democratic nation, are talking about fighting and dying to end those ideals and replacing them with a caliphate under Islamic law—at 6 years old.

Project that mentality forward 10 years and you’ll find an individual like Abdullah Elmir—a 17-year-old from Bankstown, another Western Sydney suburb. This teenager has become another pin-up for Islamic State, which has posted videos showing Elmir threatening the life of Australian Prime Minister Tony Abbott and any nation that stands in the way of Islamic State.

The work of recruiters and radical Muslim leaders in Australia is becoming more and more obvious. These videos offer a glimpse into the Australian homegrown terrorist network, despite government countermeasures to prevent Australians traveling home from war-torn regions of the Middle East such as Syria and Iraq.

However, these measures don’t prevent homegrown terrorists who never leave the country from acquiring hate-filled ideologies. Today, even youth group meetings in Australia are being used to instill a deep-seated hatred toward the West. The government can take all the preventative measures it wants, but the sad truth is that much of the damage is already done. A non-assimilating minority is quickly growing to pose a serious danger to Australia’s national security.

The footage from last September should be a stark warning to Australia. Stopping the return of Australian terrorists from Syria and Iraq is not enough. As late Trumpet columnist Ron Fraser once wrote, “[Muslim] extremist loyalty to the cause of pan-Islamism via jihad poses a real threat to the nation that feeds, clothes, shelters and educates them, and provides them with a means to make a living.”

The seemingly innocent white-clad Muslim youth of today can easily become the homegrown jihadists of tomorrow. Government efforts to keep terrorists out are made with a degree of futility because the sad truth is, the terrorists are already here.