Up to 40 people were injured, 4 of them critical, when a massive blast damaged a building in the center of the Czech capital Prague, as firefighters told AP and Russia Today Reported.
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Survivors are believed to be buried in the rubble. Police said the cause of the blast on Divadelni Street was not immediately clear. The area is currently covered with rubble, and has been cordoned off.

Windows in buildings hundreds of meters from the blast were shattered, including some in the nearby National Theater.

RT further reports that police spokesman said the blast was probably caused by gas and that there had been about 15 people in the building, which included an office of the International Air Transport Association (IATA) and an art gallery.

"There is an unknown number of injured and trapped people," Jirina Fikejzova, Prague emergency services spokeswoman, said. There have not been reports of any deaths. Neighbouring buildings have been evacuated.