"The driver looked stunned," she told a Herald reporter at the scene.
"It was a huge bang, like a sonic boom.
"The cops had their guns drawn."
The car was heading west on Church St at about 8.20am when the crash occurred.
Just before 9am the male driver was reportedly handcuffed and taken to a waiting ambulance.
He was the only person in the car.
Police have confirmed the male suffered serious injuries.
And they say the crash happened after he fled police.
While police were following the driver, a pursuit was not underway.
"Police stopped following the fleeing driver prior to the crash due the manner of driving displayed by the fleeing driver.
"The Serious Crash Unit have been advised and will be examining the scene."
The man was taken to hospital.
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