A 20-year-old man suffered life threatening injuries after his ATV rolled over in Niagara-on-the-Lake. Emergency crews were called to an ATV crash on Stewart Rd. near Carlton St. around 2 p.m. on Saturday. Police say a St. Catharines man was riding an Artic Cat ATV when he lost control and the vehicle rolled. The man was rushed to a local hospital before being transferred to an out-of-town hospital in critical condition. Detectives of the Niagara Regional Police Services Collision Reconstruction Unit are investigating the crash. Any witnesses with information that could help police are being asked to contact investigators at (905) 688-4111, ext. 5500.