One person is in a critical condition after being hit by a truck on Mangatawhiri Rd in the Waikato region.

Emergency services were called at 8.30pm tonight after a truck collided with a pedestrian at the crossroad of Mangatawhiri Rd and Bell Rd, near SH1.

A rescue helicopter is responding to transport the person to hospital.

Fire and Emergency New Zealand, St John and police are at the scene.

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The road is blocked and diversion are in place on Bell Road and Mangatangi Road.

Motorists are advised to avoid the area if possible.