137704
On April 29 , 2013 at 10:38 am CEST ( 8:38 UTC ) , an explosion occurred in a building in the centre of Prague , Czech Republic .
 Prague, Czech Republic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Prague, Czech Republic