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His gun went off. >> reporter: officials say robert bates inadvertently grabbed his handgun instead of his taser. the attorney for the family of eric harris says they don't know how an accident like this could have happened. there are questions why robert bates was involved in an operation like this. we were told he was there in a back-up capacity. attorney for the family of eric harris said he paid his way after making thousands of dollars of donations and equipment to the sheriff's office here in tulsa. sheriff's office officials say that is not the case. they say he had gone through extensi...

A reserve deputy. his attorney spoke with us and made that case. >> he is very upset about what happened. he feels badly. the incident completely took him by surprise. he has all the requisite training. taser certified. if you watched the video, you know he was quite shocked when his gun went off. >> reporter: sheriff's officers say robert bates grabbed his handgun instead of his taser. now an attorney for the family of eric harris says they don't know how a mistake could happen in this situation. of course a lot of questions why robert bates was involved in an operation like this. we are told...