Gang Members leave an ANZAC Service early, revving their motorbikes during The Last Post.

The Rebels motorcycle club have apologised for disrupting Anzac Day dawn services by revving their motorbikes.

The gang are already under the pump, after turning up late to dawn service in Waiouru, then roaring off during the Last Post.

A Taihape resident said; "I presume it was the same group of the rebels that rode through the Taihape dawn parade revving their bikes and being clowns."

@AndiBeeeee Members of the Rebels motorbike gang at the Waiouru dawn service.

A second local source said the dawn service at the Taihape War Memorial was disrupted by motorcycles.

Taihape and Waiouru are about a 20 minute drive apart.

The Rebels Motorcycle Club has apologised for disrupting today's Dawn Service in Waiouru on Saturday evening.

A written statement provided by the club to NZME news service and published online said the motorcycle club had the "upmost respect for our fallen heroes whom have given their lives for our freedom".

"We were passing through at the time of service; we stopped to pay our respects. Assuming the service was completed, we then continued on our journey. "Unfortunately, we misunderstood, causing disruption, this was not our intention. There are no excuses for the events that occurred; we can ensure you this will not happen again in the future."

The Rebels' actions at Waiouru were earlier labelled as "disgusting" by a grandmother.

Merna Brotherston was at Saturday's dawn service at Waiouru with her daughter and two grandsons when member of the Rebels Motorcycle Gang arrived late.

"A lot of people were quite disgusted, but they couldn't do anything about it because the service was on."

Their anger was compounded when the gang left in the middle of the Last Post, drowning the bugle notes out as they roared off down the road.

"I thought it was disgusting. What a complete lack of respect," Brotherston said.

The small central North Island township of Waiouru is home to huge military training area.

The army base had been a perfect place to witness the dawn parade, she said.

Video shot at the service confirmed her account of events, with the Rebels riding off just metres away from a military guard.

Brotherston's grandson Charlie said it was clear the revving engines were not meant as any sort of tribute.

"I just thought they were being dick-heads."

Andi Brotherston described the incident as "perhaps the most disrespectful moment in the history of Anzac Day," on Twitter.

"People here are so angry," she said on Saturday.

There were also gang members at the Auckland dawn service, however they were well behaved.

The Rebels' motto is "Respect Few Fear None."