CNN reports that the strike abruptly took place during a routine meeting. Gallery attendants, ticket agents and security refused to work in protest over uncontrollable crowds, understaffing and what was referred to by a union as an “untenable” working environment. No additional details were revealed.

Staff at the Louvre staged a rare work stoppage over poor working conditions and relentless crowds, as Europe grapples with the growing strain of overtourism.

One of the biggest tourist attractions in Paris abruptly closed its doors Monday, June 16. The move came amid a strike by staff at the Louvre Museum, who told CNN that they fear the building is being damaged due to too many tourists.