Theft at Louvre Museum
Theft involved a truck with a cherry picker and motorbikes.
Stolen items included two diadems, an emerald necklace, and Empress Eugénie's crown.
Jewels valued at 88 million euros.
Louvre director offered resignation after calling it a 'terrible failure'.
Culture minister refused to accept resignation.
Security overhaul in January failed to resolve staffing and overcrowding issues.
2 months ago