71041
In protest , squatters in Amsterdam had occupied a former fire department the week before the law began ( returning it to the owners control on 30 September ) and a riot occurred on 1 October when the police blocked a protest and led a horse charge upon it .
 Amsterdam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Amsterdam