Anzacs still joined in terror battle: PM

Prime Minister Malcolm Turnbull has assured Australians that the Anzacs and Turkey remain united as they were more than 100 years ago - this time in the battle against terrorism.

Across the country, hundreds of thousands of people attended services on Monday honouring those who served Australia, and those who fell doing so.

But just hours earlier a 16-year-old Sydney boy was arrested over an alleged Anzac Day terror plot.

He was taken into custody by officers from the NSW Joint Counter Terrorism Team near his Auburn home on Sunday accused of preparing to commit a terrorist act and trying to obtain a firearm.

The teen, who cannot be named for legal reasons, is expected to face Parramatta Children's Court on Tuesday.

Mr Turnbull told a service at the Australian War Memorial in Canberra that Australia, New Zealand and Turkey are still connected more than 100 years on from the Gallipoli landings.

In his first Anzac Day address as the nation's leader he reflected on the Anzac legacy and ongoing campaigns in Afghanistan and the Middle East.

"Today we offer our solidarity to the Turkish people as we and our allies battle together a new war against terrorism," he told a crowd of thousands at the Anzac service on Monday.

Australian War Memorial director Brendan Nelson used his dawn service address to pay tribute to the 102,700 Australians on the roll of honour at the memorial.

"Like us, each had only one life, one life to serve others and our nation. They chose us."