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up next for investigators , to try to search sediment on the bottom of the pond located just outside fredrick , not far from washington , d . c . it ' s part of the investigation into the deadly anthrax attacks in the fall of 2001 in which five people were killed .
 fredrick, washington , d . c, d . c, investigators, five people, the pond located just outside fredrick , not far from washington , d . c, anthrax
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 fredrick, washington , d . c, d . c, investigators, five people, the pond located just outside fredrick , not far from washington , d . c, anthrax