A hash oil manufacturer in downtown Los Angeles exploded Saturday night, shooting balls of flame out of the building. The explosion sent firefighters running for their lives. A dozen firefighters were injured, including some who tore off their burning protective equipment, including melted helmets. Newser reports police and fire investigators have now launched a criminal probe into the cause of the blast. Detectives from the LAPD's major crimes division are working with the city Fire Department's arson investigators.
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