Firefighters were called to the scene in Galpin’s Road in Thornton Heath just after 7am on Monday. The London Fire Brigade (LFB) said the cause of the fire and explosion was unknown. Six fire engines and about 40 firefighters rushed to the scene where a roof had collapsed. The LFB said it had received 13 calls about the incident since 7.08am. Fire crews from Norbury, Mitcham, West Norwood, Woodside and surrounding fire stations were dispatched to the scene.