Louvre heist: 'We have failed' says minister as security tightened

A hunt is under way to find the four thieves before the jewels - which once belonged to French royals - vanish for good.

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Thieves wielding power tools broke into the world's most-visited museum in broad daylight on Sunday, stealing eight items described as of inestimable value, before escaping on scooters.

Security measures have been tightened around France's cultural institutions, advisers for the country's interior minister said.

There are fears that, unless the thieves are caught quickly, the priceless items, including a diamond and emerald necklace Emperor Napoleon gave to his wife, will be broken down and smuggled out of the country.

The Louvre announced it would remain closed on Monday while investigations continued.