Part of a cornice that fell from a building in central Prague hit a tram stop, killing one person, officials said on Thursday.
Television footage showed a hole in the roof of the stop.
The victim was not immediately identified.
The accident happened in Lazarska Street before noon, police said.
They said the street would be closed to traffic for two hours. Several tram lines use the street.
At the time of the accident, the Czech capital was hit by a thunderstorm.
Firefighters said that after the accident they removed about 220lb (100kg) of unidentified material from the top of the building which could possibly have fallen later.
Authorities are investigating the incident.
