347013
On April 22 , 2013 , after an investigation by the Royal Canadian Mounted Police , with cooperation from and assistance by the United States Department of Homeland Security and the United States Federal Bureau of Investigation , two suspects , who are not Canadian citizens , were arrested , and charged in connection with the plot .
 Royal Canadian Mounted Police, United States Department of Homeland Security, Federal Bureau of Investigation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Canadian Mounted Police, United States Department of Homeland Security, Federal Bureau of Investigation