GAITHERSBURG, Md. (WUSA9) -- An overturned box truck snarled morning traffic on I-270 near Gaithersburg, Md.
Police say the truck overturned at 7:23 a.m. on northbound I-270 just north of I-370.
The truck appeared to be a U.S. Postal Service vehicle, as mail spilled out the back of the overturned truck.
No injuries were reported and only the far right shoulder of local lanes is getting by.
Montgomery County police are blocking entrance to the local lanes from Shady Grove Road and eastbound I-370.