Emergency personnel in Norman responded to a two-car accident at the intersection of Porter and Franklin, Saturday night.
Crews from the Norman Fire Department, the EMSTAT EMS, as well as Norman Police responded to the scene.
According to police, one vehicle was making a left turn at the intersection when the other vehicle failed to stop, T-boning the first vehicle.
First responders say three people were transported to the hospital, one of them in critical condition.
No other details are known at this time.