Multiple arrests have been made following a police chase which led to a car crashing into an Auckland train station.

Earlier on Wednesday, police spotted a vehicle in Panmure that had previously been reported as stolen. This car was then monitored by patrol units and a police helicopter before it fled.

Police say it continued to be monitored by the helicopter as it drove "dangerously" across east Auckland where the driver was seen "swerving lanes and driving into oncoming traffic".

At one point during the chase, it collided with another vehicle. The occupants of that car were not injured.

Following this, the vehicle was driven on to a Middlemore train station. Police tried to arrest four occupants of the vehicle and a taser was used while they tried to apprehend the driver.

The man then had a "medical event" and first aid was given. He has since been transported to hospital in a serious condition.

Three other occupants of the car have been arrested and a scene examination is underway.

Photos earlier sent to Newshub show several cops at a train station surrounding a man lying on the ground. A smashed white car draped in police tape is also on the train platform. A video posted to Facebook shows an officer on the train tracks. At least five police cars can be seen at the scene.

A witness also described the car chase to Newshub.

"[It was] proceeding to try and run from police. The car had been rammed, crashed into, it had run over spikes. The back right-hand wheel was completely gone. It was running on the rim," the man told Newshub.

The witness said the van was being chased by between six and ten police cars as well as a police helicopter.