The head of the rescue service attending an explosion in central Prague has said that up to 40 people have been injured.
Police have said that people are also believed to be buried under rubble, the Associated Press reports.
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
Weather: Heavy rain and strong winds in the north
His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."