Ontario Provincial Police (OPP) are investigating a five-vehicle collision that injured six people over the weekend.

Shortly after 5:30 p.m. Sunday, Lanark County OPP said its officers responded to a crash on Highway 7 in Innisville, Ont., just east of Perth.

Of the six who were hurt, three people were sent to hospital with potentially life-threatening injuries, the OPP said in a news release Monday. One person was in life-threatening condition Monday, and the others have been treated in hospital and released.

The victims ranged in age from 17 to 78, the OPP added.

Highway 7 remained closed for several hours for the investigation.

The cause of the crash is not yet known.

Anyone with information is asked to contact police.

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