Emergency services at the scene of a crash involving vehicle and a bus on Christchurch’s Southern Motorway.

They were called just after 4PM to the Halswell Junction and Springs Road roundabout.

A Fire and Emergency crew is at the scene along with St John ambulance paramedics.

A police spokeswoman said the crash involved a car and a bus.

However, a witness at the scene said they could only see a “smashed up” car.

One person was extricated from their vehicle.

A St John spokeswoman said they responded to the incident in Hornby at 406pm.

“We’re still on the scene with one rapid response vehicle and one ambulance.”

One patient is in a moderate condition and will be transported to Christchurch public hospital.

Police are also at the scene.

Traffic is still moving, but motorists should expect details due to a lane drop.