Elon Musk is beginning mass layoffs at Twitter, sharply reducing the company’s workforce of 7,500 and kicking off his wholesale overhaul of the company.

An email went out to the company’s employees late Thursday notifying employees of plans to cut jobs, informing them that by 9 a.m. Pacific time Friday, workers would receive an email with the subject line: “Your Role at Twitter.”

Those keeping their jobs would be notified on their company email. Those losing them would be told via their personal email.