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Officials Believe DC Navy Yard Suspect Was Only Shooter , Lift Lockdown ; Victims Mostly Civilians and Contracto . . . http://t.co/G6DZDcFUIX
 DC Navy Yard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 DC Navy Yard