Heat surges resulted in temperatures that reached 1000C due to chemicals, linen and the plastic floor coverings. The roof was consumed by the flames. More than 200 firefighters battled the blaze. Roads around the facility remained blocked by police as firemen battled to put out the blaze. The cause of the fire apparently remains unknown but a 69-year-old woman is believed to have started the deadly fire. The woman, who was staying in a ward for people with infectious diseases, was one of two people killed in the blaze. The Bergmannsheil hospital was built in 1888 to treat workers injured in the coal mines of the surrounding Ruhr area. It is considered one of the world’s first specialist accident and emergency clinics. Ralf Jaeger, interior minister of the state of North Rhine-Westphalia, in which Bochum lies, was at the scene early on Friday to witness the extent of the damage himself.