Sniffer dogs searching a building after a strong blast in central Prague have not yet found anyone at the scene.
Earlier, a fire services spokesman said that some people could be trapped under the rubble.
Two people are believed to be missing, but they may have left before the explosion, Czech newspaper Ceskenoviny reports, citing a police spokesman.
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The Royal Marine known as 'Marine A' is to be released on Friday according to the Justice For Marine A campaign group.
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A bid by the Government to delay publishing its plans to tackle air pollution until after the election has failed at the High Court.