Vision has emerged of a gang of teenage e-bike riders at a weekend sports event viciously attacking a 12-year-old boy.

One girl, aged 14, was seen kicking and punching the young boy at John Fisher Park in North Curl Curl, north Sydney, on Saturday.

The shocking video showed the teenager, who can’t be identified, striking the boy’s face and head in front of families at the community netball courts.

Several adults attempted to intervene but the teenager continued to hit the child, even as an adult held and tried to shield him.

At one point the teenager even attempted to take the 12-year-old’s shoulder bag.

She yelled, ‘Give me your f***ing bag’ while the boy hid behind the adults.

The attack finally ended when the girl went to a group of boys on e-bikes and got on the back of one.

The group rode away as several adults tried to comfort the 12-year-old.

A teenage girl, aged 14, was filmed attacking a 12-year-old boy at John Fisher Park in North Curl Curl, north Sydney
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A teenage girl, aged 14, was filmed attacking a 12-year-old boy at John Fisher Park in North Curl Curl, north Sydney

The teenage girl was travelling with a group of teenagers on e-bikes and attacked the boy near the park's netball courts
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The teenage girl was travelling with a group of teenagers on e-bikes and attacked the boy near the park’s netball courts

Northern Beaches Police officers attended the scene and interviewed the boy and witnesses.

‘The 12-year-old was assessed at the scene; however, did not require any medical treatment,’ NSW Police said in a statement.

‘Following inquiries, police attended a home in Curl Curl shortly after and spoke to a 14-year-old girl before cautioning her.

‘No further police action is expected.’

Netball officials on the Northern Beaches last week admitted they were concerned for the safety of players, spectators and officials after a group of e-bike riders rode onto courts on May 2.

A gang of about 15 teenagers disrupted games, threw water balloons and harassed players, prompting police to increase the presence of officers during matches.

Northern Beaches Council have also installed more signs around the park advising e-bikes are banned from the netball courts.

Independent Northern Beaches Councillor, Vincent De Luca, told the Daily Telegraph that while he didn’t see the assault on Saturday, he saw several frightened adults and children.

Several adults attempted to intervene but the girl continued attacking until finally riding away with her group
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Several adults attempted to intervene but the girl continued attacking until finally riding away with her group

He had been at the park watching family members play when he saw the commotion.

‘Clearly a serious criminal offence has been committed by the girl, in company of various other out of control youths,’ De Luca said.

‘The girl should be charged with assault and attempted theft. All the others should be charged with affray.

‘NSW Police must act. If they fail to do so, this behaviour will continue.’