Calgary police say charges are being considered after a driver believed to have been speeding failed to negotiate a turn and crashed through the window of a KFC, hitting two adults and a baby inside the restaurant.

Police say a woman driving a grey Acura was travelling eastbound on 17th Avenue S.W. around 6:20 p.m. on Monday when she arrived at the intersection with 12th Street, past which point the avenue was closed for construction.

The driver then tried to make a sharp left turn onto northbound 12th Street, according to police, but instead drove through the front window of the fried-chicken restaurant.

Her car hit a family of three inside the building — a 33-year-old man, a 30-year-old woman and an eight-month-old infant — who were sitting at a table near the window.

Calgary police are looking into whether charges will be laid against the driver of a car that crashed through a KFC restaurant on 17th Avenue last night. (Julie Debeljak/CBC)

Police say the adults were transported to hospital in serious, life-threatening condition.

The man has since been upgraded to serious but stable condition, while the woman has suffered life-altering injuries, according to police.

The baby was treated and released.

Paramedics said the driver of the car was assessed on scene and was not injured.

Police said in a release that "excessive speed is considered a factor in the collision."