Police are investigating allegations of a frightening attack on a 16-year-old girl by three men near a South Auckland park.

Police said two men allegedly attempted to grab the girl as she was walking along Coxhead Rd, Manurewa between 5.45pm and 6.30pm on Monday night.

The men were part of a group of three men who were sitting in a vehicle on Coxhead Rd somewhere between Kohiwi Rd and O'Conell Rd, the spokesperson said.

"This would have been a very frightening situation for the victim and police are currently in the process of making enquiries into this incident."

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A Facebook post apparently from a relative of the 16-year-old girl claimed that when she got home she was out of breath, her T-shirt had been torn and scratch marks stretched across her stomach all the way around to her back.

The post said two men had started chasing after the girl after she noticed them sitting in a car, and one of the men had managed to grab her and drag her to Dale Reserve, a park bordering Coxhead Rd.

The remaining man in the car had reportedly shouted "Hurry up, just chuck her in the car".

The relative said in the post that the 16-year-old managed to escape after the men paused for a rest. "Something like this has never happened before in our family," she wrote.

A police spokesperson said officers were canvassing the area for CCTV footage and speaking with neighbours.

Police encourage anyone with information about the incident, or who may have seen anyone acting suspiciously, to contact the Counties Manukau Crime Squad on 09 261 1321.