Arranged duel? Argument that turned in to shootout that turned into dual fatal shooting? Murder-suicide? Dual suicide? Accidental shooting followed by guilt-driven suicide? Yeah, this one is going to need more info...
Or.... They were both shot by someone else and robbed of their guns? Didn't really say if they were inside or outside.... If it was outside, could have just been a meeting place for a drug deal or something. Sure the police dont "THINK" anyone else was involved.... but you never know.
Unfortunate that it occurred at a shooting range. In some states, these are the last bastions of freedom left. Such incidents draw unfriendly political fire. I hate to think of what kinds of laws may be proposed, using this incident as support for the argument.
Two familys have lost love ones and the firearm community has been smeared yet once again. May the lord have mercy on their eternal souls as we continue to battle for our God given rights!