A fire broke out in the crowded República Cromañón nightclub (mostly known in Argentina as simply "Cromañón") in Buenos Aires, Argentina on 30 December 2004, killing 194 people and leaving at least 1,492 injured. The nightclub República Cromañón (Cro-Magnon Republic) was a venue that held concerts and events, on 3060-3066-3070 Bartolomé Mitre street in the Balvanera neighbourhood of Buenos Aires. It was operated by Omar Chabán, and opened on 12 April 2004 with a concert by the band Callejeros, the same band that played on the night of the fire. The club was in a two-story building, with a main entrance with six doors behind it leading into the main area of the nightclub. On the night of the fire, four of the six doors were locked. There was also a connection to a nearby hotel, an emergency exit that was locked, and another emergency exit that was blocked by a fence in front of the stage. There were hardly any fire safety measures, with no reports of a fire detection or alarm system, emergency lighting, or fire suppression equipment; ten of the fifteen fire extinguishers were unusable, with no pressure. The nightclub's fire safety license had run out the month before the fire. Fire The venue was hosting rock group Callejeros, with an audience of around 4,000 people, almost three times the venue's capacity of 1,500. The fire started when a pyrotechnic flare, a popular device in New Year's Eve celebrations, was set off and ignited foam in the ceiling. The materials used in the building for decoration were flammable: mostly wood, styrofoam, acoustic panels and a plastic net (media sombra). The net was hung from the ceiling and caught fire first, melting into a rain of fire. In some parts of the building, teddy bear stuffing was used as a cheap alternative to wool fiber. The owner and the band's lead singer had told the patrons not to use flares inside the building. Four of the six doors, some of which were fire exits, were chained shut so that "people would not enter without paying", according to Mayor Aníbal Ibarra. Most of the victims died from inhaling poisonous gases and carbon monoxide. After the fire the technical institution INTI found that, due to the materials and volume of the building, the concentration of cyanide in the air would have been about 225 ppm, sufficient to cause death within