UPDATED: Traffic is backed up following a two car crash on State Highway 29A, near Maungatapu, this morning.

A reporter at the scene says one of the vehicles appears to have hit another one that was parked under the Taipari Street overbridge.

Tow trucks removing the vehicles from the scene. Photos: Daniel Hines.

The reporter says a lamp post has also been damaged in the crash and is blocking one of the lanes of the highway.

"Two tow trucks are at the scene and contractors are sweeping debris from the road.

"Traffic is clogged up in the area."

Earlier:

Two cars are reported to have crashed on State Highway 29A, near the Maungatapu Bridge.

A caller to the 0800 SUNLIVE news hotline says a car appears to have hit another vehicle on the highway under the Maungatapu overpass.

Traffic is expected to be delayed after a crash near Maungatapu this mroning. Photo: Charlie Baxter.

It's unclear how many people are involved or how seriously injuried they are.

Motorists are being warned to expect delays in the area or use an alternative route until the crash scene is cleared.

We will bring you more information as soon as it is available.

At the scene? Call 0800 SUNLIVE or email photos to newsroom@thesun.co.nz