The city of Boston apologized after sending out an email to 100 employees exposing their COVID-19 vaccination status and positive COVID-19 test results in mid-January.

The city’s Human Resources Department had intended to remind 100 employees in Boston on Jan. 18 to get vaccinated against COVID-19 ahead of the city’s vaccine mandate. But due to HR forgetting that the recipients were not BCC’d when sending the email, all the email addresses of those who received the email were made public, according to the Boston Herald.