Do you know if anyone was hurt? I used to live in PG county and still know several people who work in the courthouse. Is this the one near the Equestrian Center or the one off of Route 1?
My mom used to work there, sounds like arson to me. The timing is certainly suspiscious.
DC Channel 4 is saying it's the old courthouse building in Upper Marlboro. I haven't seen any film of the fire, so can't report much else. I hope your friends are safe.