A vehicle has crashed into a Bay of Plenty river and people are unaccounted for.

Emergency services were alerted that a single vehicle had gone down a bank and entered the Waioeka River, between Waioeka Pa Rd and Waiata Rd about 10.20am.

One person reportedly has serious injuries, police said.

Two people are currently unaccounted for and Search and Rescue teams are travelling to the area to join the effort to find them.

Anyone downstream of the Historic Tauranga Bridge should call 111 if they have information that may assist police.

Please reference P060175638.

State Highway 2 is currently closed and traffic management is being arranged. Motorists should expect delays.

A Hato Hone St John spokesperson said they were notified of a motor vehicle incident in Waioeka about 10.10am.

One ambulance is at the scene so far.

More details to come.