Originally posted by the Voice of America.
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                            CZECH EXPLOSION, 1ST UPD

   A powerful explosion in the Czech capital, Prague, has injured up to 40
   people, causing police to seal off a tourist area and evacuate
   buildings.
   Police say the cause of the blast on Divadelni Street is not yet clear,
   but speculate it may have been caused by a gas leak. It shattered some
   windows in the nearby National Theater. One report said it could be
   heard as far away as Prague Castle, a kilometer and a half across the
   Vltava River.
   Officials say some people may still be trapped in the building where
   the explosion took place.
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   [1]http://www.voanews.com/content/czech-explosion-1st-upd/1650722.html

References

   1. http://www.voanews.com/content/czech-explosion-1st-upd/1650722.html