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Confidential health data or personal information of more than 750,000 people may have been accessed in a cyberattack on Los Angeles County employees in May that led to charges this week against a Nigerian national, officials have disclosed.

The May 13 attack targeted 1,000 county employees from several departments with a phishing email. The message tricked 108 employees into providing usernames and passwords to their accounts, some of which contained confidential patient or client information, officials said.

Most of the 756,000 people whose information may have been accessed had contact with the Department of Health Services, according to the county. A smaller amount of confidential information from more than a dozen other county departments also was compromised.

Among the data potentially accessed were names, addresses, dates of birth, Social Security numbers, financial information and medical records — including diagnoses and treatment history — of clients, patients or others who received services from county departments.

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