WASHINGTON – Prince William County fire officials say one person was injured after an explosion at a company in Manassas, Va.

Officials say a hydrogen tank exploded, went up through the roof of a building at UTRON Inc. and came crashing back down into the building, which is located in the 9400 block of Innovation Drive.

The building sustained significant damage to the roof and other portions.

Employees from the damaged building and surrounding businesses were evacuated due to the damage.

The injured employee was taken to the hospital.

Fire investigators with the Prince William County Fire Marshal’s Office are looking into the explosion.

The building has been deemed unsafe.

The company’s website says it is known best for “leadership in researching, designing, and building Combustion Light-Gas Guns for use as army artillery, naval guns, and direct-fire guns.”

WTOP’s Hank Silverberg contributed to this report. Follow @hsilverbergWTOP and @WTOP on Twitter.