One person is dead after a vehicle crash in Christchurch, last night.

The incident happened on Tunnel Road about 5.30pm.

Three others were injured in the crash, which police initially reported as a single-vehicle crash.

Canterbury Metro Commander Superintendent Lane Todd has confirmed involved two vehicles.

Three men and a woman were in the first vehicle when it collided with a bridge on Tunnel Road about 5.30pm, he said.

"The woman died at the scene, while the men sustained minor to moderate injuries.

"The second vehicle collided with the first before also hitting the bridge. Its driver, the sole occupant, has been taken to hospital with minor injuries," he said.

Tunnel Road will remain blocked for a number of hours.

The Serious Crash Unit and CIB are investigating.