Three people are dead following a three-vehicle crash in South Glengarry Township. Emergency crews responded to a crash on County Road 17, near County Road 27, in the Williamstown area, at approximately 9:45 p.m. Thursday. Ontario Provincial Police say three people were killed in the crash. The 61-year-old driver and a 54-year-old passenger in one vehicle from South Glengarry and the 18-year-old driver of another vehicle from North Glengarry were pronounced dead at the scene. Police say the occupants of the third vehicle were transported to hospital for assessment. County Road 17 remained closed in both directions between County Road 27 and Fairview Road on Friday morning for the investigation. The road reopened at around 9:30 a.m. Anyone with information is asked to contact the Ontario Provincial Police Stormont, Dundas and Glengarry Detachment at 1-888-310-1122. Williamstown is located approximately 109 kilometres east of downtown Ottawa and 20 kilometres from Cornwall.