Several armed men attacked the national oil corporation headquarters (NOC) in the Libyan capital on Monday and several blasts could be heard.
Gunfire could be heard as a security force allied to the Tripoli-based government arrived at the landmark building located in central Tripoli.
No claim of attack was immediately made as firefighters and ambulances arrived to treat the wounded streaming out of the building.
The NOC building is covered mainly in glass, and a witness said several people had been wounded by shattered windows.
