Update, 2.45pm: NZ Police advise that State Highway 2 at Karangahake Gorge has now been reopened following a cycling incident there earlier.

Police thank motorists for their patience.

A rescue helicopter flew into the gorge to help rescue the injured cyclist.

Earlier, 12.45pm

NZ Police report that State Highway 2 at Karangahake Gorge is currently down to one lane due to an incident where a cyclist has been injured.

Initial reports suggest they are in a serious condition.

A SunLive reader at the scene says that a person has fallen from the riverside pathway and traffic is stopped in both directions. A helicopter is also at the scene.

Police say that emergency services will work to have the road fully reopened as soon as possible.

Motorists should expect delays.

At the scene? Phone 0800 SUNLIVE or email newsroom@thesun.co.nz