"It was a policeman, and he went to help him."
Just as with misreporting of weapons by those unfamiliar, this may be a uniformed mall guard.
But if it's police...I'm sticking with Jewelry store robbery.
Why would a robber randomly start shooting upon entry? I don't think that makes sense. Admittedly, we're dealing with first reports, but robbers want the loot first and foremost, not a bloodbath.