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Ankara police chief Ercument Yilmaz visited the site of the morning blast but refused to say if a bomb had caused the explosion .
 Ankara, Ankara police, Ankara police chief, Ankara police chief Ercument Yilmaz, the site of the morning blast, a bomb
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:
 Ankara, Ankara police, Ankara police chief, Ankara police chief Ercument Yilmaz, the site of the morning blast, a bomb