An armed group has stormed the Tripoli headquarters of the National Oil Corporation (NOC) in Libya.
Security forces clashed with the armed men at the landmark building in the centre of the city, and blasts and gunfire could be heard, witnesses say.
A security official at the site said at least two staff members and two gunmen have been killed in the attack.
Last week, the UN announced that a truce between warring militias had been agreed in the capital.
A UN-backed government is nominally in power in Tripoli but militias occupy much of the rest of the country.
