UPDATE: 6PM A standoff in Kings Park has ended after police moved in and made a dramatic arrest.
A 50 year-old man from Joondalup, whose erratic behaviour triggered a police response, arrived at Kings Park at around 1pm in the company of his elderly father, who later escaped from the vehicle.
After a tense standoff the 50 year-old man drove off in his car and was chased by police.
TRG vehicles then intercepted the vehicle, a Hyundi Elantra, a short distance away.
Police said bean bag bullets were fired at the car during the short pursuit.
Shortly after the shots were fired witnesses described hearing a car crash.
Earlier police cordoned off an area in the park as they tried to negotiate with the man.
A police spokesman said it was feared the man had flammable items in the vehicle, later identified as a gas bottle and cigarette lighter.
"A police negotiator had been attempting to reason with the man throughout the incident," a police spokesman said.
The man was taken into custody just before 6pm.
TRG officers and the armoured Bearcat attended the incident.
The man has been taken to Sir Charles Gairdner Hospital for treatment for a facial injury.