A 6-year-old girl has succumbed to her injuries she sustained in a horrific crash at the south London Costco outlet on Friday.

London police confirm that Addison Hall passed away after being struck by a car that backed into the entrance of the store, striking several others.

An autopsy to determine an official cause of death is scheduled for Monday.

Three people remain in hospital at this time.

The girl's mother, Danah McKinnon-Bozek has been upgraded to fair as of Sunday.

Her daughter, Miah Bozek, 3, remains in critical condition.

An emergency C-section was performed and police will also not comment on the status of the baby.

Three other people, including the driver of the vehicle that hit the store, have now been released from hospital.

Witnesses say they heard a loud revving sound before a red sedan backed full-speed into the store's front doors bringing piles of glass crashing down.

Araam Wendy, a Costco employee who was doing some shopping on a day off, says, "You just hear a large bang and you hear loud cries and screams and you just hear the glass shatter, everywhere you see debris."

He says many people came to the aid of those injured, and he tried to keep people away from the shattered glass, but "No one knows why it happened or how it happened."

The investigation continues, but it was determined that alcohol was not a factor.