The Police Service of Northern Ireland (PSNI) says human error was responsible for a massive data breach of sensitive material.
It's believed identities of officers were contained in a spreadsheet published in relation to a Freedom of Information request.
The names, ranks and stations of all serving PSNI officers and details of civilian staff were mistakenly released.
An emergency meeting of Northern Ireland's Policing Board has been called for tomorrow.
However, Assistant Chief Constable Chris Todd, says the information has now been taken down and there are no immediate security concerns.
"The information was taken down very quickly, but nevertheless, I do appreciate the concern that it will cause.
"We'll seek to find the extent to which that has been viewed, but what I would say is although the error was our own, once that information was out there, if anybody did have access to it, I would ask them to delete it straight away.
"It is limited to surname and initial only, so there's no other personal identifiable information contained within the information that was published.
"But that will still be of significant concern to many of my colleagues. I know that, and we will ensure that we do everything we can to mitigate any security risks that are identified."
