Updated July 20 at 7:30 a.m.
Greater Sudbury Police say the incident involved a recreational tube being towed by boat, which collided with three kayaks. The investigation is being conducted by the police service's traffic management unit.
Original story:
Greater Sudbury Police tweeted at around 4 p.m. that they were on the scene of a boating collision on Ramsey Lake.
Four people were transported to hospital by EMS with non-life threatening injuries.
The GSPS are continuing to investigate this incident, but the cause of the collision is still unknown at this time.
Please check back with Sudbury.com for more information as it becomes available.