One person was killed and three others were seriously injured in a rollover in Port Sydney on Sunday, Ontario Provincial Police say.

Police said a northbound sport utility vehicle rolled on Highway 11, just north of the Highway 141 off-ramp, shortly after 6:30 p.m.

The vehicle came to rest in the centre median.

A male occupant was pronounced dead at the scene. The victim's name hasn't been released.

Three other occupants were taken to local hospitals, where two are listed in critical condition and a third is listed in serious condition.

Highway 11 was closed for several hours as police conducted an investigation at the scene.

Anyone with information is asked to call OPP at 705-789-5551 or Crime Stoppers at 1-800-222-8477.