Update at 11:15 a.m. – The all-clear has been given and the hazmat team is packing up their gear.

Some roads are being shut down in the area of 2800 S. Randolph Street in Shirlington due to a hazmat investigation.

According to scanner traffic, the U.S. Patent and Trademark Office at 2800 S. Randolph received an envelope with a white powdery substance in it. The Arlington County Fire Department’s hazmat team is checking to see whether the substance is hazardous.

A similar investigation into a suspicious substance was conducted at the same office last Tuesday.