The Secret Service is investigating reports that members of the activist hacking collective Anonymous have posted Republican presidential front-runner Donald Trump’s personal information online, including his Social Security number.
“The U.S. Secret Service is aware of the Internet postings of Candidate Donald Trump’s personal information,” a Secret Service spokesman told TIME. “We are working with the Federal Bureau of Investigation in this matter.”
In addition to his Social Security number, the information allegedly includes Trump’s mobile phone number, the name and contact information for his lawyer and the names of some of his family members.
A Twitter account that regularly tweets on behalf of the group has already denounced the information as “outdated,” calling the account that released the data “not a credible source.”