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Ten firefighters were transported to local hospitals, including to the Washington Burn Center in D.C., Johnson said. Four firefighters remain hospitalized with varying levels of injury and are expected to survive, he said.

The two occupants of the home and several pets had been evacuated, Johnson said. The two residents had minor injuries and have been treated and released, he said.

A Loudoun County sheriff's deputy was also treated for injuries at the scene, according to the sheriff's office.

The exact cause of the explosion remains under investigation.

\"We can assume it was propane related but no complete cause has been initiated,\" Johnson said.

\"PHOTO:
WJLA
PHOTO: In this screen grab from a video, a scene of a home explosion is shown in Sterling, Virginia, on Feb. 17, 2024.
>

The investigation will also seek to determine how the leak occurred and how the gas got into the home.

The Loudoun Sheriff's Office and the Bureau of Alcohol, Tobacco, Firearms and Explosives are aiding in the investigation, according to Loudoun Fire-Rescue Assistant Chief James Williams.

The large debris field stretched into the street and into the vicinity of neighboring homes. The house that exploded is destroyed, the assistant chief said.

\"This is the worst call that we can respond to,\" Williams said.

The chief said he is proud of the firefighters' response and credited it with limiting the number of fatalities in the incident.

\"Our folks did their job, they showed up and they did what they had to do,\" he said. \"We prepare for this. We have a full plan for dealing with line-of-duty deaths. We hope you never have to use it but we're using it today.\"

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