OPP say its Underwater Search and Recovery Unit is on-scene at Owen Sound Harbour.
In a tweet posted at 10:49 a.m. Sunday, police said they received reports of a vehicle driving into the water shortly after 5 a.m.
OPP believe the vehicle is either a minivan or large wagon.
They say the vehicle entered the water at the intersection of 1st Ave E. and 11th Ave. E.
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Anyone with information or video surveillance of the area is asked to contact OPP at 1-888-310-1122.
More to come.