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By Associated Press

A teenager was charged with plotting a terrorist attack on an Australian Veteran's Day ceremony, police said Monday, the second year in a row that authorities say they have thwarted an attack linked to the national holiday.

The 16-year-old boy was charged with one count of planning a terrorist act after being arrested at his home in western Sydney on Sunday, one day before Australians across the country gathered at ceremonies to mark ANZAC Day. The annual holiday commemorates the April 25, 1915, Gallipoli landings in Turkey — the first major military action fought by the Australian and New Zealand Army Corps during World War I.

A member of the Light Horse brigade takes part in Anzac Day services Monday on the Gold Coast in Currumbin, Australia.Glenn Hunt / EPA

The teen had previously been on authorities' radar and was believed to hav ebeen acting alone, New South Wales Police Commissioner Andrew Scipione said. The teen's home was searched, but Scipione declined to say if anything was seized. He wouldn't release any other details of the alleged plot.

The teen was expected to face a children's court later Monday. He could face a maximum sentence of life in prison if convicted.

This is the second year in a row that police say they have stopped an attack on an ANZAC Day ceremony. Last year, police in Melbourne arrested five teenagers on suspicion of plotting an ISIS-inspired attack intended to coincide with the city's ANZAC service.

2015: Teens' ANZAC Day Terrorist Plot Foiled: Australia Cops

The age of the Sydney suspect was troubling but unsurprising, Justice Minister Michael Keenan said.

"Unfortunately, this is part of a pattern that we have been observing, where younger and younger people are targeted and incited to go and commit an act of terror," Keenan told reporters in Perth.

Australia's government raised the country's terrorism threat level in 2014 in response to the domestic threat posed by supporters of ISIS. Police have since conducted dozens of raids that they say have been aimed at thwarting multiple plots in Australia, including an alleged plan to attack government buildings and a naval base in Sydney.