Police said it appeared a cyclist had been run over by another cyclist in Swanson on Thursday morning.

A cyclist has been taken to Auckland City Hospital after being seriously injured in a bike crash.

Police said officers were currently at the scene on Swanson Rd in West Auckland.

A spokesman said at this stage, it was understood the injured cyclist was run over by another cyclist about 11am on Thursday.

"The person has been transported to hospital with injuries described as serious," he said.

A St John Ambulance media alert said two ambulances were sent to the scene and one person was transferred to Auckland City Hospital.

The rear end of a vehicle at the scene appeared damaged and could be seen being looked at by police, but its involvement in the crash was unknown.

SUPPLIED The serious crash unit is investigating the incident.

The serious crash unit was in attendance and there was a partial road closure, the police spokesman said.