11560
In April 2014 , US President Barack Obama declared unequivocally that the islands would be covered by the treaty in the event of an armed attack on them .
 location: US; person: Barack Obama
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: US; person: Barack Obama