NBC is getting closer to blaming someone for the edits made to the tape of the 911-call George Zimmerman made just before he shot Trayvon Martin, Reuters reports.

The edits made it sound as though almost the first thing Zimmerman reported about Martin was that he was black, when in fact Zimmerman was only responding to a later question from the dispatcher about what Martin looked like.

NBC has already apologized for the mistake.  But it has offered no explanation of how or why it happened.

Now, according to Christopher Fancescani and Peter Lauria at Reuters, the network has found someone to blame -- a "seasoned" producer.

Reuters sources at the network describe the edits as "a very bad mistake," but not a deliberate attempt to make Zimmerman sound racist.

NBC News boss Steve Capus's job is apparently secure.