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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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