Uber’s CEO, Dara Khosrowshahi, who was placed in the top job in August, revealed the data breach last month shortly after studying of it himself, saying that “none of this should have occurred.” Uber’s security exercises are also under investigation in a high-stakes legal battle with self-driving car organization Waymo, an Alphabet Inc subsidiary.

Uber last week announced it fired its chief security officer, Joe Sullivan, over his part in the 2016 data breach, which endangered data belonging to 57 million clients and about 600,000 drivers. The resignations Friday came amid climbing frustration within Uber’s security team over Sullivan’s release and the company’s treatment of the public disclosure of the breach.

The three managers who resigned were Pooja Ashok, chief of staff for Sullivan; Prithvi Rai, a senior security engineer and the number two manager in the department; and Jeff Jones, who handled physical security, the Uber spokesperson said. Ashok and Jones will remain at the business until January to assist in the transition, the spokesperson said.

A fourth person, Uber’s head of Global Threat Operations, Mat Henley, began a three-month medical leave, said a separate source familiar with the situation. The variances include most of Sullivan’s direct reports.

None of the four directly replied to requests for an explanation. Emails in association with the departures, represented by the separate source, complained of nervous and physical strain from the past year.

Sullivan in August told News that his security team added around 500 employees.

Leadership in the unit has been in confusion since the end last week of Sullivan and a deputy, as well as Uber’s access that it paid $100,000 to hackers to delete taken data from the October 2016 breach and keep it secret, while failing to notify the incident to controls or warn consumers that their phone numbers and other data had been exposed.

In the Waymo case, deposition at a pretrial hearing this week focused on allegations by former employee Richard Jacobs that Uber had a distinctive unit within its security team that tried to obtain programming code and other trade puzzles from rivals.

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