Thieves have stolen five expensive paintings, including a work by Picasso, from the National Museum of Modern Art in Paris, France Info radio reported on Thursday.
Other works missing include paintings by Henri Matisse, Georges Braque, Fernand Leger and Amedeo Modigliani. The thieves apparently broke into the museum through a window.
Initial reports said that the value of the paintings could be in hundreds of millions of euros. If confirmed, it would make it one of the biggest art heists in history.
The museum would not confirm the report. The Organised Crime Brigade (BRB) is handling the investigation.