STERLING, Va. — One firefighter was killed and nine others were injured when an explosion in a Washington, D.C., suburb on Friday leveled a home where they were investigating a gas leak. Two civilians were also injured.The firefighters were called to the home in Sterling, Virginia, 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.The blast and fire occurred while firefighters were inside the building, James…
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