Prime Minister Scott Morrison has distanced Australia from Turkish authorities' claims they disrupted a plot to blow up Thursday's dawn service at Gallipoli.

Key points: Turkish authorities say they arrested a suspected Islamic State member planning to attack the Gallipoli service

Turkish authorities say they arrested a suspected Islamic State member planning to attack the Gallipoli service Scott Morrison said the arrest was "fairly routine" and links to the Gallipoli ceremony were "inconclusive"

Scott Morrison said the arrest was "fairly routine" and links to the Gallipoli ceremony were "inconclusive" Mr Morrison said the service would go ahead as planned

Turkish authorities said they arrested a 26-year-old Syrian man in Tekirdag, a north-western province close to the Gallipoli peninsula, on the morning before the dawn service.

They said he was a suspected Islamic State member who was planning to stage an attack at Gallipoli.

The suspect was identified in Turkish media simply as "A H", but the name Abdulkerim H later emerged, along with a blurred passport photo.

The man's arrest was connected to earlier arrests of IS suspects in the past 10 days. Four Syrian suspects were arrested on April 16, including an alleged IS emir, or team leader. One other suspect was arrested on April 18.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 1 minute 56 seconds 1 m 56 s Scott Morrison comments on suspected Gallipoli plot

Turkish security sources told the ABC the planned attack was in retaliation for the Christchurch mosque attacks.

As hundreds of Australians and New Zealanders gathered at Gallipoli, Mr Morrison cautioned people against "overstating any link between" the arrest and the dawn service given the suspect was arrested approximately 170 kilometres away from Anzac Cove.

"It is fairly routine for Turkish authorities to arrest people with suspected terrorist links," he said.

"The reports that we are receiving are inconclusive about any link between that arrest and any possible planned event at Gallipoli itself.

"In fact, to make that assumption would be, I think, making a very big assumption.

"This is more of a routine thing that we've seen happen with Turkish authorities and we could not say at all that there is any link between that arrest and any planned event at Gallipoli."

Attendees at the dawn service at Gallipoli faced heavy security from Turkish military police. ( AP: Emrah Gurel )

The service went ahead as planned, and Australian Defence Force Chief General Angus Campbell reflected on the horrors faced by the Anzacs during the Gallipoli campaign.

"Death became relentless here. Few places were safe from Turkish fire and life was a constant strain," General Campbell said.

"Some of the frontline trenches were separated by mere metres and those defending the trenches had to be vigilant.

"An attack could come quickly, by day or night."

Hundreds of people gathered at Anzac Cove for the annual dawn service. ( AP: Emrah Gurel )

New Zealand parliamentary speaker Trevor Mallard said the day was not about marking victory or defeat, but about paying tribute to "the valour, the service … of all those who fought" in Gallipoli.

Earlier, authorities evacuated the memorial site and searched for bombs or other threats, but found nothing, while attendees were patted down by heavy security after walking through metal detectors.

Turkey banned its own citizens from attending the Anzac Day dawn service due to security concerns.