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. 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.

“Team, In an effort to place Twitter on a healthy path, we will go through the difficult process of reducing our global workforce on Friday,” according to multiple versions of the email obtained by The Washington Post. “We recognize that this will impact a number of individuals who have made valuable contributions to Twitter, but this action is unfortunately necessary to ensure the company’s success moving forward.”

Anyone who did not receive an email by 5 p.m. was told to follow up with the company. The offices would be closed Friday.

“We acknowledge this is an incredibly challenging experience to go through, whether or not you are impacted,” the email continued. “We are grateful for your contributions to Twitter and for your patience as we move through this process.”

It was the Musk team’s first official companywide communication with his staff.

In response to the email, dozens of Twitter employees posted a single blue heart to say goodbye to their colleagues. The identical hearts were posted one after the another in a long scroll on the company Slack.

Some workers had already begun losing their access to internal systems such as email and messaging service Slack, and those at the company Thursday described seeing the fallout in real time.

“Numbers dwindling down in the (Slack) channels last hour, people dropping like flies,” said one, who spoke on the condition of anonymity for fear of retribution.