New Delhi, Dec. 19 -- Employees at the Louvre Museum voted to extend a strike that has disrupted operations at the world's most visited museum, though the venue partially opened Wednesday to allow visitors to enjoy its highlights.

The museum said visitors had access to a limited "masterpiece route" which includes Leonardo da Vinci's "Mona Lisa" and the Venus de Milo.

"Due to a strike, some rooms in the Louvre Museum are . closed," it said on social media. "We apologize for any inconvenience."

Union workers are protesting chronic under-staffing, building deterioration and recent management decisions - pressures intensified by a brazen crown jewels heist in October that exposed serious security lapses.

The strike decision came during a ...