Lockdown at Joint Base Andrews due to armed individual.

TL;DR
Joint Base Andrews is on lockdown as officials investigate an armed person seen near base housing carrying an AR-15 rifle. The base is searching for a white man last seen wearing a purple sweatshirt and black shorts. No shots have been fired, and there are no immediate reports of injuries.
- Armed person leads to lockdown at Joint Base Andrews WBAL TV Baltimore
- Joint Base Andrews on lockdown following report of active shooter WTOP
- Joint Base Andrews active shooter report prompts lockdown FOX 5 DC
- Joint Base Andrews on lockdown after unauthorized person seen with rifle The Washington Post
- Joint Base Andrews on lockdown amid search for person with gun WUSA9.com
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