A senior national government official said earlier that authorities had not turned over the investigation to the Royal Canadian Mounted Police, a sign that investigators believed it was unlikely that terrorism was the motive. The official agreed to reveal that information only if not quoted by name.

Authorities released few details in the case, saying the investigation was still underway, with witnesses being interviewed and surveillance video being examined.

"I can assure the public all our available resources have been brought in to investigate this tragic situation," Toronto Police Services Deputy Chief Peter Yuen said earlier.

Police said the suspect was scheduled to appear in court at 10 am Tuesday, and that information on the charges against him would be released at that time.

The driver was heading south on busy Yonge Street around 1:30 pm and the streets were crowded with people enjoying an unseasonably warm day when the van jumped onto the sidewalk.

Ali Shaker, who was driving near the van at the time, told Canadian broadcast outlet CP24 that the driver appeared to be moving deliberately through the crowd at more than 30 mph.