DCist reader and Flickr pool contributor Andy Jones sent us this set of photos documenting a mass exodus from a delayed Brunswick line MARC train on Friday. more ›

Police and fire officials have apparently evacuated the Washington Marriott hotel, located at 1221 22nd Street NW, due to an investigation into a potential chemical reaction. According to D.C. Fire and EMS' Twitter feed, HazMat workers are currently "working to mitigate [a] chemical reaction in [the] service area." 22nd Street near the hotel has been closed off for some time, though M Street is reportedly open to traffic. At this time, there have not been any injuries to guests at the hotel that we can report, but one EMS worker is being evaluated. more ›

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. more ›

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 place -- meaning the building has not been evacuated, but no one is being allowed to leave, either. We'll update when we have more details. MORE: No illnesses have been reported, but the bottle apparently came with a note that raised suspicions. Mass. Ave. is currently closed from New Jersey to Columbus Ave., as is North Capitol from E to G Streets NE. 10:17 a.m.: DDOT now says Mass. Ave. and North Capitol streets have reopened. more ›

The 700 block of First Street NE is currently closed while crews respond to a suspicious substance found in a nearby building. more ›

If your lunchtime routine often includes the Potbelly Sandwich Works location at 1900 L St. NW, you may have run into some trouble snagging that meatball sub on wheat bread today. The restaurant was briefly evacuated in the middle of the lunch rush on Monday due to customer complaints of an apparent mild irritant in the air. D.C. Fire/EMS spokesperson Pete Piringer said hazmat tests for possible air toxins inside the shop all came up negative, but several people were evaluated for symptoms such as watering eyes and sneezing. The fire department doesn't know for sure what caused the reactions, but Piringer speculated it may have been something like a mild pepper spray substance. Or maybe it was just all those hot peppers? The whole incident was over in under an hour, and the Potbelly is back to business as usual. more ›