The inspector general for the intelligence community has informed members of Congress that some material Hillary Clinton emailed from her private server contained classified information, but it was not identified that way.
Because it was not identified, it is unclear whether Clinton realized she was potentially compromising classified information.
The IG reviewed a "limited sampling" of her emails and among those 40 reviewed found that "four contained classified [intelligence community] information," wrote the IG Charles McCullough in a letter to Congress.
McCullough noted that "none of the emails we reviewed had classification or dissemination markings" but that some "should have been handled as classified, appropriately marked, and transmitted via a secure network."
The four emails in question "were classified when they were sent and are classified now," spokeswoman Andrea Williams told CNN.