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.
More top news
A-level results will be on Thursday, but what should you do if your results are not quite what you had hoped for?
Away from the cloudier/damp southeast it's a day of sunny spells and showers on Thursday.
The former US president has Tweeted six of the top 10 most liked tweets ever - with current president Donald Trump not making the list.