U.S. spy agencies have told Congress that Hillary Clinton’s home computer server contained some emails that should have been treated as “top secret” because their wording matched sections of some of the government’s most highly classified documents, four sources familiar with the agency reports said.

The two reports are the first formal declarations by U.S. spy agencies detailing how they believe Clinton violated government rules when highly classified information in at least 22 email messages passed through her unsecured home server.