The strike notice has been upheld and the strike was approved unanimously, Valerie Baud, a spokeswoman for the CFDT union, told reporters outside the museum.
Proposals from the Ministry of Culture "are considered insufficient and unacceptable by the employees," a statement from the CGT union said.
On Monday, angry museum employees began a strike demanding better working conditions. They are criticizing, among other things, staff shortages and general decay at the prestigious art institution. Tensions have been further heightened after the spectacular jewel theft from the museum almost two months ago.
According to the CGT and CFDT unions, the strike has broad support among the workforce of 2,200 people.
While the employees voted to extend the strike, hundreds of people with tickets lined up outside the building.
The management of the museum, the world's most visited with over eight million visitors per year, stated at lunchtime on X that the opening was delayed due to the strike and that parts of the museum will remain closed.
