Police, fire and hazmat crews responded at about 12:50 p.m. to a report of a suspicious package that was delivered to an office at 1850 K Street NW. Early reports indicate the package was sent to the offices of the American Association for Clinical Chemistry, located on the sixth floor of the building. That office has been evacuated, but no word yet on whether the rest of the building will also be cleared. We’ll update…

A hazmat investigation at the building that houses the National Postal Museum has shut down several blocks in the immediate area as well as around nearby Union Station. U.S. Capitol police, D.C. police and D.C. Fire/EMS crews are on the scene investigating an unknown suspicious substance found inside a bottle. One employee inside Postal Square, located at the intersection of North Capitol Street and Massachusetts Ave. NE, tells DCist he’s been asked to shelter in…

Photo courtesy DCist reader Ethan L. The 700 block of First Street NE is currently closed while crews respond to a suspicious substance found in a nearby building. D.C. police responded to 750 First Street NE at about 1:40 p.m. for a suspicious package call. There they discovered an unknown white powdery substance, and subsequently requested D.C. Fire/EMS and Hazmat crews to assist at the scene, Fire department spokesperson Pete Piringer said. Those crews…