Robbery at a museum in Ancient Olympia

Armed robbers have stolen dozens of artefacts from a Greek museum dedicated to the history of the Olympics.

Two masked men smashed display cabinets after overpowering a guard in the town of Olympia, officials said.

Local mayor Thymios Kotzias said items of "incalculable" value had been stolen, but gave no details.

The BBC's Mark Lowen reports.