Describing a crime

One day in a bank branch where there were ten clients and two employees. Then, a man with a mask and a bag with the dollar symbol entered in the bank and took out a gun from the bag. The robber ordered one of the employees to fill in the bag but meanwhile, the other employee pressed the silent alarm button so the police arrived in a few seconds. The police tried to negotiate with the robber but they weren’t able to do that. Some hours later, a hostage start to speak and the robber shout and ordered him to shut up. Then he shot to a place where there weren’t any person with the aim of frightening the hostage but he didn’t see that there was a red barrel so the shot made it explode killing the robber and provoking a big fire. Minutes later the firefighters arrived and them save the hostages and they extinguished the fire.