Trade unions at the Louvre Museum in Paris on Monday called for a rolling strike next week over working conditions, piling more bad news on the beleaguered institution.

The announcement came a day after the world's most visited museum admitted to a major leak in late November and nearly two months after an embarrassing heist in which French crown jewels were stolen from its permanent collection.

In between those two incidents, it had to close a gallery containing ancient Greek ceramics over fears for the safety of a ceiling.

Three unions -- the CGT, Sud and the CFDT -- called for a rolling strike starting Monday December 15 which was voted for at a staff meeting of around 200 employees "with unanimity", CFDT official Valerie Baud told AFP.

If followed widely by the Louvre's 2,100-stron

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