An undetermined number of packages and 10 UPS trucks burned at a facility in Frederick Maryland Monday.
Frederick County fire officials were called to the scene around 11:40 p.m.
According to fire crews, it took 45 minutes to get the flames under control.
Officials said the building suffered mostly exterior damage since a sprinkler system activated inside the main structure.
The cause of the fire is under investigation.
A UPS spokesperson said the company is working to identify and notify shippers of the damaged packages, as well as reroute packages that would have gone out on the damaged trucks.
The Associate Press contributed to this story.