Update, 8:35 p.m.: A Fairfax Fire spokesperson confirmed that a minor flare up was discovered in the corner of the building, and that equipment and firefighters were sent back out.
The building was reported to be worth over $5 million It's not yet known what was lost in the part of facility known as Section G where the fire broke out.
A likely cause is expected to be reported in the morning by fire investigators.
Update, 8:19 p.m.: Firefighters were sent back to the facility a few minutes ago, on reports of a possible rekindling of the fire -- within 10 minutes after a caller reported seeing flames.
Original story, 5:53 p.m.: A fire at a storage facility in Herndon grew into a three-alarm blaze Sunday, with about 60 firefighters working on it.
Fairfax County Fire and Rescue responded around 11:50 AM Sunday for the fire in in the 2900 block of Centreville Road.
With smoke visible for miles, firefighters worked for hours to control the fire and the lingering hot spots. The second floor of the facility collapsed.
No major injuries were reported. Centreville Road was closed for several hours.
ABC7's Kris Van Cleave reported from the scene.