1. “One by one, one by one. Holy God, I’ve never seen such a sight before.”

A witness described seeing a van smash into person after person along Toronto’s main thoroughfare.

The Canadian authorities said the van drove onto the sidewalk in two locations, killing at least 10 people and injuring 15 others before the police were able to stop it and take the driver into custody. Several witnesses said the crash debris included a child’s stroller.