Yahoo's massive, hidden email search would be first of its kind

If the accusations are true, a report that Yahoo colluded with the government to search emails would be the first of its kind.

USA Today cited a Reuters report, in which unnamed sources said Yahoo secretly agreed to search all its users' incoming emails for a specific but unknown word or phrase on behalf of either the National Security Agency or the FBI.

While Yahoo didn't confirm or deny the report, officials said the company didn't break the law.

Read more from USA Today.