Two Dead After Fireworks Cache Illegally Stored At House Sets Off Series Of Explosion KEY POINTS Multiple peripheral buildings were involved in the explosion Police are investigating the incident as a possible felony Two people were killed after a cache of fireworks exploded Tuesday at a house in Ontario, California, setting off a series of blasts that rocked the neighborhood. The explosion took place around noon and led to evacuations of the immediate area. Ontario Fire Department Chief Ray Gayk confirmed during a press conference that there were two fatalities in addition to some injuries. He said it's believed that the fire was sparked by commercial-grade fireworks illegally stored at a residential lot near West Francis Street and Fern Lane.