Ottawa paramedics responded to an incident on St. Laurent Boulevard at McArthur Avenue to treat three people who had been hit by a vehicle.
Officials say the collision happened at 10:13 a.m., Thursday.
A child suffered a serious head injury but is in stable condition, another child sustained minor injuries, while a woman in her 40s also suffered a head injury. All of the victim's injuries are considered non-life threatening.
The Ottawa Police Service had closed St. Laurent Boulevard from Donald Street to Cote Street.
That road has since re-opened.