A six-year-old girl who was hit by a car that crashed through the front of a Costco store in London, Ont., has died in hospital, police said Sunday.

Addison Hall, 6, was struck by a car that crashed into a Costco store in London, Ont., on Friday, and later died. (Facebook)

She has been identified as Addison Hall of London.

The girl's pregnant mother and three-year-old sister were also struck when the driver of a red Monte Carlo reversed through the front entrance of the store around noon on Friday.

Danah McKinnon Bozek was rushed to hospital and underwent an emergency C-section. Her condition was upgraded to fair on Sunday.

Police say the newborn, along with the woman's three-year-old daughter, Miah Bozek, remain in critical condition.

The collision caused panic among those shopping in the busy store on Wellington Road South. Two other people who were injured in the crash as well the driver of the car have been released from hospital.

London police Sgt. Amanda Pfeffer, of the traffic management unit, said Sunday that the investigation is still in its early stages.

"This is a collision that impacted many people, including emergency responders, those available at the scene to render assistance and those at the scene that observed what transpired," Pfeffer said Sunday.

Police are asking any witnesses to come forward.

Pfeffer confirmed that the driver involved in the collision was a woman in her early to mid-60s.

"She has been released from the hospital and she's absolutely an integral part of this investigation," Pfeffer said.

Bozek's husband, Steve Bozek, posted a photo of his daughter Addison as a new profile picture on his Facebook page Saturday, a day after the tragedy.

The posting has prompted an outpouring of condolences from friends and family.

Danah and Steve Bozek were married in 2012, according to her Facebook page.