Diversions are in place on State Highway 1 in North Canterbury following a crash between a truck and a car.

A police spokesperson told Chris Lynch Media that emergency services are responding to the “serious crash” on Omihi Road, Greta Valley.

The spokesperson said, “Two people are reported to be in a critical condition and a helicopter has been deployed. A further two people have minor injuries.”

“The road is blocked, and diversions will be in place for several hours. The diversions are at Waipara and Greta Valley on State Highway 1. Motorists are advised to expect delays and to avoid the area,” they said.

A St John spokesperson said, “We are still on scene with two ambulances, a helicopter and an ops manager.”

“Still no update on patient status,” the St John spokesperson added.

More soon.