Update at 3:18 p.m. — We’re told that the situation is under control. The powder does not appear to be dangerous.
An Arlington County hazardous materials team has responded to an office tower at 1001 N. 19th Street in Rosslyn. Initial reports suggest that an employee on the 12th floor opened a letter from a former employee and white powder fell out.
So far, there are no reports of anyone in the office becoming sick as a result of the white powder.
The building is the headquarters of FBR Capital Markets, a large investment bank. It’s not clear whether the office involved belongs to FBR or another tenant.