A hacking group leaked personal work details of more than 40,000 people at the US Department of Homeland Security on Wednesday, BBC, CNBC and NPR report. The data includes names, work addresses and phone numbers, along with job titles and offices. Staff at Immigration and Customs Enforcement and Customs and Border Protection are among those named.

The BBC and CNBC put the total at more than 41,000. More than 21,000 of the records are for border agency staff, BBC and NPR report. The BBC counted nearly 6,600 ICE workers. NPR counted about 10,000 tied to ICE and its investigations unit.

A group calling itself the Department of Peace said it got in through Okta, a sign-in service DHS uses. The group gave the data to Distributed Denial of Secrets, which posted it in a searchable database called Icepick. The BBC reports the records also list dozens of operation names that had not been made public.

The group said the hack was a response to Homeland Security Secretary Markwayne Mullin. "On July 17th, Markwayne Mullin said he was 'turning up the heat.' This is what happens to ICE when you do that," a group spokesperson wrote.

A DHS spokesperson said the agency is "aware of a potential breach and is actively working to address the situation swiftly and effectively." An Okta spokeswoman said the company is secure and has no evidence its systems were breached, the BBC reports. CNBC said Okta did not respond to its request.

NPR notes the list covers about a fifth of a workforce of a little more than 220,000. A journalist who helped build the database rejected claims that the group was doxing workers. He said officials who hide their faces need oversight.

The leak follows a hack of FBI agent data last month by a group called ShinyHunters, the BBC reports. Anger over immigration raids has grown this year, with ICE agents shooting more than two dozen people.

What we know: More than 40,000 DHS staff records, including ICE and CBP workers, were posted online, and DHS says it is responding.
What we don't: How the hackers got in, and whether any workers face new safety risks.