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Paramedics help injured people after an explosion in downtown Prague, Czech Republic, Monday, April 29, 2013. Police said a powerful explosion has damaged a building in the center of the Czech capital and they believe some people are buried in the rubble. (AP Photo/Petr David Josek)

Paramedics help injured people after an explosion in downtown Prague, Czech Republic, Monday, April 29, 2013. Police said a powerful explosion has damaged a building in the center of the Czech capital and they believe some people are buried in the rubble. (AP Photo/Petr David Josek)

Explosion shakes Prague

An explosion in central Prague on April 29, probably caused by gas, injured as many as 40 people, officials said, and neighboring buildings - including the National Theatre - had to be evacuated.