An Indian couple visiting Canada and their three-month-old grandchild died in a road mishap during a police chase in Canada's Toronto city, media reports said.

The incident took place on Highway 401 east of Toronto.

Two grandparents, a 60-year-old man and 55-year-old woman, were killed in the collision, Ontario’s Special Investigations Unit (SIU) was quoted as saying by CBC News.

Special Investigations Unit said in a statement: "An occupant of the cargo van was pronounced deceased at the scene. Three individuals – a 60-year-old, a 55-year-old and an infant – were also pronounced deceased at the scene. One other person was transported to hospital for treatment of serious injuries."

The collision was reportedly the result of a police chase that began with an alleged liquor store robbery in Bowmanville, Ont., in the regional municipality of Clarington.

The police began the chase after the suspect drove the wrong way on Highway 401 in Whitby.

Seven investigators, one forensic investigator and one collision reconstructionist continue to investigate this case.

SIU later said the suspect was a 21-year-old man.

"The 38-year-old male passenger was transported to hospital for treatment of serious injuries," read the statement.

Milica Maljkovic Birkett, who is a witness in the incident, told CBC News: "I was like, 'Oh my God, like what just happened? What's going on?'"

"It's so scary," she said. "For whatever reason, somehow my life was spared. But [four] others were taken and that was just really heavy."