Two men died after a collision involving two boats on Stoney Lake Saturday night.

Peterborough County OPP say the boats collided just before 9:30 p.m.

There were three people aboard each boat.

A man, 31, was pronounced dead at the scene. The OPP used marine units and a helicopter to search for another man, also 31, from Mississauga, but the search was unsuccessful.

Four other people involved were taken to hospital with injuries ranging from serious to non-life-threatening, OPP reported.

The crash happened on Young’s Bay near Northey’s Bay Road.

The OPP remained at the scene Sunday to take measurements, document the scene and collect evidence, the OPP stated.

The OPP Underwater Search and Recovery Unit (USRU) was called in to search for the missing man.

The cause of the collision remains under investigation.