Twitter’s offices were forced to close abruptly on Thursday after hundreds of employees refused to work under Elon Musk’s new vision for the social platform.

According to two people familiar with the company’s action, company officials informed employees that all buildings would be temporarily closed, effective immediately, and that their ability to rent with ID access would be suspended for the time being. The offices are set to reopen on Monday. According to a Slack message seen by Insider, the closing of offices is a dramatic move intended to “prevent physical sabotage while they sort out access revocations.”

The announcement came about an hour after Musk’s deadline of 5 p.m. ET for Twitter employees to officially sign on to his new “extremely hardcore” plans for the company. Less than half of the company’s remaining 4,000 employees signed up to work at “Twitter 2.0,” effectively resigning under the terms Musk offered in a Tuesday ultimatum.

Twitter’s offices were forced to close abruptly on Thursday after hundreds of employees refused to work under Elon Musk’s new vision for the social platform.

According to two people familiar with the company’s action, company officials informed employees that all buildings would be temporarily closed, effective immediately, and that their ability to rent with ID access would be suspended for the time being. The offices are set to reopen on Monday. According to a Slack message seen by Insider, the closing of offices is a dramatic move intended to “prevent physical sabotage while they sort out access revocations.”

The announcement came about an hour after Musk’s deadline of 5 p.m. ET for Twitter employees to officially sign on to his new “extremely hardcore” plans for the company. Less than half of the company’s remaining 4,000 employees signed up to work at “Twitter 2.0,” effectively resigning under the terms Musk offered in a Tuesday ultimatum.