A bystander in Virginia captured the moment a massive explosion rocked fire crews responding to a utility emergency Tuesday night.

Fairfax County Fire and Rescue Department were at the scene in the 3800 block of South George Mason Drive in Bailey's Crossroads around 3 p.m.

In a short video from the scene, smoke can be seen coming out of a building while a firefighter works to open a door.

The moment the firefighter pries the door open, a massive fireball erupts from the building. The blast was so strong that the person filming appears to lose control of their camera.

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The firefighter seen at the door closest to the blast is OK, the department said on social media. 

"Firefighters put their lives on the line everyday to protect the lives and property of Fairfax County," a statement read. 

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The fire department is not releasing the name of the firefighter involved.