Matthew Heather and his mother Rangi said in August that they were upset over the way the police treated him.

A south Auckland police officer who pushed a teenager off his bike will not face criminal charges.

The unidentified officer was caught on video shoving Matthew Heather, 13, off his push bike and up against a fence in August.

The incident unfolded in Mangere Bridge on August 27 as Matthew and a group of friends were on their way home from a "siren battle".

Lawrence Smith/Fairfax NZ Matthew Heather, 13, was thrown to the ground after swearing at a police officer.

The battles see neighbourhood gangs strap speakers or "sirens" to their push bikes and compete with other gangs to see who can make the most noise.

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Matthew said it was about 5.30pm when the police showed up to break up the audio battle.

Facebook An image taken from Cee La Tonga Taumoefolau's Facebook video shows the officer pushing Matthew off his bike.

"They just said to get off the road and hurry home. As they left I crossed the road and decided to bike with the other crew [home]."

He said the police pulled a u-turn and swore at him.

After he swore back, the officer "came out of the car and came from behind and pulled me off my bike, then slammed me on the ground", he said.

"Then he picked me up and ... threw me against the fence."

Matthew was uninjured during the incident.

Counties Manukau west area commander Inspector Jason Hewett said at the time that multiple calls were made to police about the group's behaviour.

"There were reports of excessive noise, alleged fighting, and of cyclists weaving in and out of traffic which caused fear for their safety."

However, police had "concerns" about the behaviour in the video and launched their own internal investigation, Hewett said.

The matter was also referred to the Independent Police Conduct Authority.

Police upper north professional conduct manager Inspector Tracy Phillips said on Wednesday that the police took the matter seriously and conducted a thorough investigation.

"In line with what the victim's family wanted, it has been decided that the officer will not face any criminal charges.

"He will meet with the victim and his family to offer an apology."

Phillips said the officer had displayed "excellent conduct" during his three years with police and that was taken into consideration.

The officer will also be subject to an employment investigation.

Matthew's mother Rangi said she was happy with the outcome.

"I'm actually the one who decided to let the police resolve it, and I think there's really no other comment to make."