Ambulances and firefighters gather at the headquarters of the national oil company after an attack by gunmen in Tripoli, Libya, Sept. 10, 2018. (Photo: AP)

TRIPOLI, Sept. 10 (Xinhua) -- The Libyan Interior Ministry's Special Deterrence Force announced on Monday taking control over the headquarters of the National Oil Corporation (NOC) in the capital Tripoli after gunmen attacked the building earlier.

"A terrorist attack by the Islamic State targeted the NOC. So far, the remains of the suicide bombers have been found," the Special Deterrence Force said in a statement.

"The staff and civilians were evacuated from corporation's building. Investigation is underway to find out the identity of the suicide attackers," the statement said.

A source of the corporation told Xinhua that the NOC headquarters has been attacked by gunmen with light weapons, who also exchanged fire with the security forces, confirming that the attack caused casualties.

Interior Minister Abdassalam Ashour also said that the corporation was attacked by "six people, who stormed the building early in the morning and used machine guns and grenades and detained a number of hostages."