Uber last week said it fired its chief security officer, Joe Sullivan, over his role in the 2016 data breach, which compromised data belonging to 57 million customers and about 600,000 drivers. The resignations Friday came amid mounting frustration within Uber’s security team over Sullivan’s dismissal and the company’s handling of the public disclosure of the breach.

So he fired the CSO, and then those reporting to Sullivan resigned (The departures include most of Sullivan’s direct reports.).