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Dozens injured from blast in Prague

David W Cerny / Reuters

An injured woman is pictured after an explosion in Prague April 29. 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.

Matej Divizna / Getty Images Contributor

A firefighter inspects the scene of an explosion on April 29, in Prague, Czech Republic. At least 40 people were injured in the large explosion at a Film and TV school building on the Smetana embankment.

David W Cerny / Reuters

Firefighters search the area after an explosion in Prague April 29. 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.

From AP: PRAGUE -- A powerful explosion damaged an office building in the center of the Czech capital on Monday, injuring up to 40 people. Authorities believed some people were buried in the rubble.

It is not certain what caused the blast in Prague's Divadelni Street, but a natural gas explosion was suspected, police spokesman Tomas Hulan said.

The street was covered with rubble and was sealed off by police, who also evacuated people from nearby buildings and closed a wide area around the explosion site. Continue reading.

Czech police have released video showing last month's gas explosion in Prague. NBCNews.com's Dara Brown reports.