The Serious Crash Unit is at the scene of a serious head-on crash at Omori, beside Lake Taupō.

A helicopter was dispatched this afternoon when one person was trapped in a vehicle with serious injuries, and another with moderate injuries was extracted from a vehicle.

St John said it also sent three vehicles to the scene.

A police spokesperson said the crash at the intersection of State Highway 41 and Pukawa Rd was first reported to emergency services at 12.10pm this afternoon.

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In a statement, police asked motorists to avoid the area.

Fire crews are helping clear the scene and direct traffic, but the affected roads remain open.