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Police and volunteers had to hike through the night to reach the scene of the avalanche and the police faced communication problems as radio reception was hampered by the mountainous terrain .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None