Loudoun County fire crews are on the scene of a 3-alarm fire at a commercial building in Ashburn.

Firefighters were called to 21263 Smith Switch Road just before 11 a.m. Friday. Large plumes of smoke can be seen coming form the large building.

The building was under construction at the time of the fire.

No injuries have been reported.

Stay with NBCWashington on-air and online for more on this developing story.