They weren't firing indiscriminately, they were firing at the army of cops running at them with guns drawn. That's why this could have been avoided. Pick a better spot for your next ambush...
It's still not known who fired first, the cops or the robbers....
According to our member who had a friend on scene, as soon as the UPS truck came to a stop, the robbers started shooting indiscriminately. If that is indeed the case, should the cops have just stayed in their vehicles?