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Injured people leave an area after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday injured about a dozen people and others were trapped in a building damaged by the blast, a Reuters witness and emergency services officials said. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

Injured people leave the area after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday, probably caused by gas, injured as many as 40 people, officials said, and neighboring buildings - including the National Theatre - had to be evacuated. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

Injured people sit on a sidewalk near the area of a blast after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday injured about a dozen people and others were trapped in a building damaged by the blast, a Reuters witness and emergency services officials said. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

Injured people are tended to by rescue workers after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday, probably caused by gas, injured as many as 40 people, officials said, and neighboring buildings - including the National Theatre - had to be evacuated. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

A paramedic bandages a woman injured by a powerful gas blast on April 29, 2013 in Prague's historic center. The blast injured up to 20 people, four seriously, rescuers said, adding that it was possible some people were buried in the rubble. MICHAL CIZEK/AFP/Getty Images ( 519334366 )

Rescue workers help a woman who was injured in a blast next to the building where an explosion happened on April 29, 2013 in Prague, Czech Republic. Up to 20 people were injured in the blast in a multistory house in the historic centre of Prague, rescuers said. The police have sealed off the area popular with tourists and evacuated people from several houses. MICHAL CIZEK/AFP/Getty Images ( 519334446 )

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) ( Czech Republic Explosion )

A fire engine arrives at the scene of a strong blast in a building in the centre of Prague, Czech Republic, Monday, April 29, 2013. After the explosion, probably caused by gas leak, there are some 40 injuries, mostly light. The blast broke windows in a broad vicinity, a number of people have been cut by the glass. Rescuers are still looking for possible people under the debris. (AP Photo/CTK, Stanislav Zbynek) ( Czech Explosion )

Firemen work at the scene of a strong blast in a building in the centre of Prague, Czech Republic, Monday, April 29, 2013. After the explosion, probably caused by gas leak, there are some 40 injuries, mostly light. The blast broke windows in a broad vicinity, a number of people have been cut by the glass. Rescuers are still looking for possible people under the debris. (AP Photo/CTK, Stanislav Zbynek) ( Czech Explosion )

Firemen and experts investigate the building damaged in a gas blast by on April 29, 2013 in Prague, Czech Republic. 35 people including foreigners were injured in the blast in a multistory house in the historic centre of Prague and causing panic in the Czech capital. STRINGER/AFP/Getty Images ( 519340812 )

A man looks out the broken window near the scene of a strong blast in a building in the centre of Prague, Czech Republic, Monday, April 29, 2013. After the explosion, probably caused by gas leak, there are some 40 injuries, mostly light. The blast broke windows in a broad vicinity, a number of people have been cut by the glass. Rescuers are still looking for possible people under the debris. (AP Photo/CTK, Stanislav Zbynek) ( Czech Explosion )

Policemen and firefighters inspect the scene of 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) ( Czech Republic Explosion )

Firefighters search the area after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday injured about a dozen people and others were trapped in a building damaged by the blast, a Reuters witness and emergency services officials said. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

A rescue worker looks at his dog as they search the area after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday, probably caused by gas, injured as many as 40 people, officials said, and neighboring buildings - including the National Theatre - had to be evacuated. REUTERS/Petr Josek ( CZECH-EXPLOSION/ )

Rescue workers inspect a scene of a gas explosion in downtown Prague, Czech Republic, Monday, April 29, 2013. A powerful explosion badly damaged an office building in the center of the Czech capital Monday, injuring up to 35 people. (AP Photo/Petr David Josek) ( Czech Republic Explosion )

Police officers walk over shattered glass after an explosion in Prague April 29, 2013. The explosion in central Prague on Monday injured about a dozen people and others were trapped in a building damaged by the blast, a Reuters witness and emergency services officials said. REUTERS/David W Cerny ( CZECH-EXPLOSION/ )

A car damaged by an explosion is towed away by police in Prague April 29, 2013. The explosion in central Prague on Monday, probably caused by gas, injured as many as 40 people, officials said, and neighboring buildings - including the National Theatre - had to be evacuated. REUTERS/Petr Josek ( CZECH-EXPLOSION/ )