*An NBC News probe found that one of its “seasoned” producers was responsible for a misleadingly edited clip of George Zimmerman’s 911 call the network broadcast during coverage of the Trayvon Martin shooting, network sources told Reuters.

More than half a dozen news staff were interviewed for the network’s internal investigation. NBC’s edited 911 call placed just before he shot Trayvon Martin made it appear Zimmerman immediately told police Martin was black, but the full recording reveals that the neighborhood watch captain mentioned the teen’s race when responding to a question posed by the dispatcher.

Network sources declined to identify the producer and did not indicate whether the producer or other staff would be subject to disciplinary action.

NBC has apologized for the incident but said it would not release names of employees involved. Execs have vowed to take rigorous steps to formalize mews division standards following the incident.