The US military has provided logistic and security support to an FBI team, which investigated an attack on the US consulate in the east Libyan city of Benghazi, the Pentagon said Thursday.

The team visited Benghazi for several hours and departed there Thursday morning. "At the request of the FBI, the (Defense) Department provided logistic and security support to the investigation team in order to conduct work onsite in Benghazi," Pentagon spokesman George Little told a news briefing.

"The activities of the investigation team and support provided by DOD (Department of Defense) were fully coordinated with the State Department and the Libyan government," Little said.

Though declining to reveal details of the operation, Little said the military support included providing airlifting service for the FBI team during the mission.

The US government has been aggressively looking into precisely what happened on Sept. 11, when US Ambassador Christopher Stevens and three other US diplomats were killed in the attack in Benghazi.

"We've been actively chasing leads in various ways," Little said, adding that the US intelligence community, the State Department and FBI have been working to determine what happened in the incident.

The US government has determined that the attack was related to terrorism, after originally suspecting that it was triggered by a controversial anti-Islam film.

US media revealed that classified US documents were still left on the site of the consulate which was badly damaged by the attack, but Little did not confirm nor deny that the FBI mission was to recover these sensitive materials.

The Pentagon spokesman added that the US military stands ready to support security for American military and diplomatic personnel in the region. "We have the assets in the region to do just that," he said.