An armed group has stormed the headquarters of the National Oil Corporation (NOC) in Libya’s capital, Tripoli.
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.
Last week, the UN announced a truce between warring militias had been agreed in the capital.
A UN-backed government is nominally in power in Tripoli. However, militias occupy much of the rest of the country.
An NOC member of staff, who said he had jumped out of a window to flee, told Reuters news agency three or five gunmen were shooting inside the building and several people had been shot.