Attorney General Eric Holder on Friday appointed two U.S. Attorneys to head an investigation into a recent series of national security leaks.

Holder appointed U.S. Attorney for the District of Columbia Ronald Machen Jr. and U.S. Attorney for the District of Maryland Rod Rosenstein to investigate and criminally prosecute “possible unauthorized disclosures of classified information.”

“The unauthorized disclosure of classified information can compromise the security of this country and all Americans, and it will not be tolerated,” Holder said in a statement.