More than 10,000 people received letters this week from the Park Hill School district notifying them of a "potential data security incident" that occurred earlier this year.
The threat applies to current and former employees, and students.
District officials said a former employee downloaded files containing the personal information of 10,210 individuals onto a hard drive sometime between February and April. That information, which included, in some cases social security numbers, was later posted online.
A resident alerted the district on April 1 that the sensitive information was available, according to a news release from Park Hill. An internal investigation was launched. The district said it worked with the FBI and Google to take the information down.
The district identified potential victims and sent home a letter offering free identity monitoring services. Park Hill said it is updating its policies and will require training for employees who handle sensitive information.
“Going forward what we're looking at is to ensure that our policies more clearly prohibit employees from being able to take this kind of information outside of the district,” Park Hill Superintendent of Schools Scott Springston explained.
The district said they have no evidence of theft or misuse following the breach.