Napoleon's Kremlin letter sold for 150,000 euros

A letter written by Napoleon in 1812 promising to blow up the Kremlin has been sold at auction for more than 150,000 euros.

It was written in code to his foreign minister during his ill-fated campaign in Russia.

The letter has been bought by the Museum of Letters and Manuscripts in Paris.

The BBC's Hugh Schofield reports from the French capital.