At least 13 people have been injured after a powerful explosion damaged a building in the centre of the Czech capital Prague.
A powerful explosion has damaged a building in the centre of the Czech capital Prague, the Associated Press reports.
Police spokesman Tomas Hulan said it is not immediately clear what caused the blast and it is believed some people are buried in the rubble.
At least 13 people have been injured, fire service spokeswoman Pavlina Adamcova said.
Windows in buildings located hundreds of metres from the blast were shattered, including some in the nearby National Theatre.
Czech artist David Cerny has turned a London bus into a robotic sculpture. The bus does press-ups with the help of an engine powering a pair of robotic arms. Cerny hopes it could become an unofficial mascot of the London 2012 Olympic Games.
It will be parked outside the Czech Olympic headquarters in London for the duration of the Games.