Attorney General Eric Holder called the leaks about U.S. surveillance programs "extremely damaging" and vowed justice for whomever disseminated the information.
Appearing at a U.S.-European Union ministerial meeting Friday in Dublin, Holder was asked by a reporter why the United States hasn't requested the arrest of Edward Snowden, the self-avowed National Security Agency leaker.
Holder didn't mention Snowden's name and said the case remains under investigation. Snowden provided documents to journalists revealing the existence of secret programs to collect records of domestic telephone calls in the United States and the Internet activity of overseas residents.
"The national security of the United States has been damaged as a result those leaks. The safety of the American people and the safety of people who reside in allied nations have been put at risk as a result of these leaks," Holder said. "We are presently in the process of that investigation, and I'm confident the person who is responsible will be held accountable."