The Associated Press reports:

A powerful explosion damaged an office building in the center of the Czech capital, Prague, Monday, injuring up to 40 people. Authorities believe some people are buried in the rubble.

It is not certain what caused the blast in Divadelni Street, but it was likely a natural gas explosion, 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.

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