The Austrian authorities say they have arrested a man in Vienna on suspicion of extortion.
They say he had asked for fifteen million dollars from the businessman Muhammed al-Fayed for documents he said related to the death of Mr al-Fayed's son Dodi and Diana, Princess of Wales, in a high speed car crash in Paris last August.
A statement from Mr al-Fayed's company Harrods said the case followed an inquiry by one of his staff into allegations that the British intelligence service and the American CIA were involved in a plot to kill Diana and Dodi.
Mr al-Fayed has frequently asserted they were murdered, but has offered no evidence.
From the newsroom of the BBC World Service