Three teens on the run after car crashes during police pursuit in Sydney

Three teenagers are on the run after an allegedly stolen vehicle they were in crashed during a police pursuit in Sydney.

Police had been following a four-wheel-drive through the city's south-west suburbs about 6pm yesterday when it crashed at a roundabout outside Heckenberg Public School on South Liverpool Road in Heckenberg.

Four teenagers are believed to have been inside the car.

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One allegedly fled down South Liverpool Road as officers pursued on foot, leaving the three others inside the car to flee in another direction.

A 14-year-old boy was found at a nearby home and charged with a string of driving related offences.

The three others remain on the run.

Witnesses were shocked as they watched the incident unfold.

"[The teen] opened the door, took off and police were chasing him," one witness told 9News.

"I was scared because I've never seen anything like this," another said.