My younger brother was standing abour 75 feet from the table when the shot was fired.
According to him (which is first/seconhand info)...
A single round was fired, accidentally, into a metal toolbox.
Supposedly a dealer handed a gun to a customer to examine. The dealer removed the magazine, but there was a round in the chamber. Boom!
Other story is the customer saw the gun by a cash register, picked it up, and pulled the trigger. Boom!
Since my brother was close to the site, but not involved, he has only been getting secondhand info.
Keep your eyes on the news, it is sure to make the papers.
TheRedGoat