A 17-year-old girl was killed today after part of a building used as a marriage hall in Bangalore collapsed after a cooking gas cylinder exploded. Ten people were also injured in the incident. The cylinder exploded between 1.30 and 2 this afternoon and led to a huge fire. It brought down not just the wedding hall but the three-storey building next door as well. While rescuing persons trapped within the debris, four firemen were injured as another cylinder exploded.