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Lahars are extremely destructive : they can flow tens of metres per second , they have been known to be up to deep , and large flows tend to destroy any structures in their path. Notable lahars include those at Mount Pinatubo and Nevado del Ruiz , the latter of which killed thousands of people in the town of Armero .
 Mount Pinatubo, Nevado del Ruiz, Armero
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mount Pinatubo, Nevado del Ruiz, Armero