Hillary Clinton may have sent more classified information than was previously known while she was secretary of state.

At least one of the seven DVDs of Clinton’s emails from her private server that the FBI sent to the State Department contained classified material, Vice News reported Wednesday. What the classified information discussed is unknown.

This revelation came from an ongoing Vice News inquiry into Clinton’s emails.

A Justice Department attorney made the disclosure during a hearing Wednesday in U.S. District Court in Washington, D.C., part of a Freedom of Information Act (FOIA) lawsuit VICE News filed against the FBI for a wide range of records the bureau recovered from Clinton’s server.

Vice News had to go to court, where a Justice Department attorney disclosed the new information.