Patrol car wasn't using emergency lights or flashers as it followed ambulance.
A Dallas, Texas woman was struck and killed by a police officer as she crossed the street early Sunday morning.
The incident took place at about 3 a.m. as the officer was following an ambulance to a disturbance call.
The ambulance was operating with lights and sirens activated, but the officer was not.
After the ambulance passed, 43-year-old Beverly Kirk stepped into the roadway and was fatally struck by the officer's patrol car.
Officers at the scene said that they are not required to run lights and sirens when responding to disturbance calls.
However, in 2008, after 10-year-old Cole Berardi was struck and killed by a Dallas police officer responding to a disturbance call, then-Chief of Police David Kunkle required officers to use lights and sirens whenever they are driving over the speed limit.
Dallas police said Monday morning that they will not make any comments concerning the fatal crash until the investigation is completed, which could take several weeks.
Police also said they will not comment further on issues of department policy regarding lights and sirens, as per orders given to the media relations office.