Two Durham police officers have been charged in connection with a multi-vehicle collision last spring that killed four people, including two grandparents and their infant grandchild, following a police chase of a suspect driving the wrong way on Canada’s busiest highway, Ontario’s police watchdog says.

Sgt. Richard Flynn and Const. Brandon Hamilton have been charged with three counts each of criminal negligence causing death and two counts each of criminal negligence causing bodily harm, the Special Investigations Unit said in a news release Friday.

The charges stem from the crash on April 29, 2024 in Whitby, Ont., in which police officers chose to pursue a liquor store robbery suspect driving the wrong way on Highway 401.