A 36-year-old man, who was taken to Bluewater Health to be treated for non-life-threatening, was also riding the ATV.
Police say the accident occurred as the result of the ATV losing control. The names of the riders have not been released.
The area of McGregor Rd between LaSalle Line and Highway 40 (Churchill Rd) will remain closed while the incident is investigated by the Sarnia Police Traffic Division. If anyone has any information in regards to this incident, they are asked to call Const. Mark Berger at (519) 344-8861, ext. 6156.