A massive explosion at a hash oil factory in downtown Los Angeles injured 11 firefighters as they worked to extinguish a fire. <br /> <br />According to reports, three of them are in a critical condition, and two have been put on ventilators. <br /> <br />Following the large blast, more than 200 firefighters rushed to the scene and extinguished the fire. <br /> <br />It is still unclear what caused the explosion, but it appears that butane, a highly flammable gas, was being used in the factory in the extraction process of a chemical from cannabis to produce hash oil. Report by Avagninag. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
