Tridentis, a privately-held professional engineering firm, is located inside Washington DC’s Navy Yard. Since earlier this morning, the company has been live-tweeting from inside the lockdown.

Hat tip: Raphael Gluck.


Breaking: Shooting at Washington Navy Yard; Injuries reported [pics, on-scene reports]; Update: One injury confirmed, officer down? Update: Multiple fatalities reported; Update: Multiple shooters?

Guess who was the first celebri-ghoul to politicize Navy Yard shooting

#NavyYardShooting: Unconfirmed reports indicate more than one shooter

Reagan National Airport halts flights due to Navy Yard shooting [photos from tarmac]