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Associated Press
Firefighters and rescue workers work at the scene of a strong blast in a building in the center of Prague, Czech Republic, in the morning on Monday, April 29, 2013.  A powerful explosion badly damaged an office building in the center of the Czech capital Monday, injuring up to 40 people. Authorities believe people may still be buried in the rubble.  (AP Photo/CTK, Michal Dolezal)

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