The US Department of Homeland Security (DHS) asked ⁠an Icelandic hosting company on Thursday to take down or limit access to data related to thousands ⁠of agency personnel, saying ⁠the content ​put them at risk, according to the request posted online by hosting company FlokiNET.

The database “places more than ⁠40,000 identifiable individuals at risk of harassment, stalking and physical harm”, the request said.

ZeroFox, a company authorized by the US ⁠Immigration and Customs Enforcement (ICE) agency to pursue content removal actions, cited the figure in ​an email to FlokiNET.

FlokiNET’s ‌CEO, Kolja Weber, told ‌Reuters that his company would not remove the DHS data because it ‌included government employee work addresses and work phone numbers, not personal phone numbers and addresses.

A DHS spokesperson said the agency “is aware of a potential breach and is actively working to address the situation swiftly and effectively. We take all security threats against our employees and officers seriously ‌and will work to ensure all are properly protected.”

The non-profit data transparency group DDoSecrets released data on more than 40,000 DHS personnel ​on its website on Wednesday, alongside a separate, searchable database developed by hacker and journalist “maia arson crimew”. The database was briefly inaccessible on Thursday but was soon republished at a different domain.

A group calling itself “the Department of Peace” claimed responsibility ⁠for obtaining the data, and said in a statement on Wednesday ​that DHS ​employees “have our information, so it’s only ​fair that we have theirs” and that it hoped ​the data “can be ‌used to limit ​further harm ​by the DHS and supports all efforts in that direction”.

Privacy advocates have criticized the DHS’s use of personal data from other agencies, including Medicaid records and taxpayer data, for immigration enforcement.