Virginia: An explosion possibly caused by a gas leak levelled a home in Sterling, Virginia, Friday night, killing a firefighter and injuring 11 other people, authorities said. Firefighters were called to the home on Silver Ridge Drive by a report of a gas smell shortly after 7:30 p.m. and a fiery explosion took place about 30 minutes later, fire officials said. Virginia: An explosion possibly caused by a gas leak levelled a home in Sterling, Virginia, Friday night, killing a firefighter and injuring 11 other people, authorities said. Firefighters were called to the home on Silver Ridge Drive by a report of a gas smell shortly after 7:30 p.m. and a fiery explosion took place about 30 minutes later, fire officials said.