Employees braced for widespread layoffs at Twitter Friday as new owner Elon Musk overhauls the social platform.

In a letter to employees obtained by multiple media outlets, the company said employees would find out by 9 a.m. Pacific Standard Time if they had been laid off.

The email did not say how many people would lose their jobs. Some employees tweeted early Friday that they had already lost access to their work accounts.

The email to staff said job reductions were "necessary to ensure the company's success moving forward."

Twitter's roughly 7,500 employees have been expecting layoffs since Musk took the helm of the company.

Already, the billionaire Tesla CEO has fired top executives, including CEO Parag Agrawal, on his first day as Twitter's owner.

He also removed the company's board of directors and installed himself as the sole board member. As of Thursday, Musk and Twitter had given no public notice of the coming layoffs.