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Twitter's offices shut down briskly on Thursday as hundreds of employees refused to comply with Elon Musk's new vision for the social platform.

Company officials told employees all buildings were being temporarily closed, effective immediately, and that their ability to renter with ID access was being suspended for the time being, two people familiar with the company's action told Insider. The offices are expected to reopen Monday.

A current employee noted the closing of offices intended to "prevent physical sabotage while they sort out access revocations," according to a Slack message. The closure was first reported on Twitter by Zoe Schiffer of the Platformer newsletter.

Less than 50% of the company's remaining staff of roughly 4,000 people signed up to work at "Twitter 2.0," as Insider reported, meaning they effectively resigned under the terms Musk offered in a Tuesday ultimatum. 

This is the second time offices have abruptly closed since Musk took over Twitter. The social giant closed offices and barred employees from entering the evening Musk began to enact mass layoffs about three weeks ago. In an email sent at the time regarding the offices being closed, the company said the move was to "ensure the safety of each employee as well as Twitter systems and customer data."