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Investigators say clues collected over the last few days have already pointed them to locations both near and far outside the port city of Aden , but they wo n't say there 's any indication that the plot here goes beyond Yemen 's boarders .
 the last few days, Aden, Yemen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 the last few days, Aden, Yemen