Washington: The US Justice Department has filed charges regarding the attack on a US mission in Libya that killed four Americans, including an ambassador.
The charges, which are under seal, would be the first from the investigation into the attack in Benghazi nearly one year ago.
The CNN, citing people briefed on the matter, said on Tuesday that the charges were against Ahmed Khattalah, the leader of a Libyan militant group suspected of being behind the attack.
The Wall Street Journal, citing "people familiar with the matter," also reported charges had been filed, but did not specify against whom.
The Justice Department refused to comment to a news agency, saying only that "the department`s investigation is ongoing. It has been, and remains, a top priority."
The Obama administration had been criticised for failing so far to bring charges over the incident, in which dozens of heavily-armed militants overran the mission and a nearby CIA annex on September 11, 2012.
Republicans have accused the Obama administration of deliberately trying to cover up what happened.