Libya revolt: Ras Lanuf
Pro- and anti-government forces have been battling for ground in Libya. Explore the map below to find out more about the key flashpoints.
Government forces were advancing towards the oil port of Ras Lanuf on Monday, launching multiple air strikes.
Troops backed by helicopter gunships also attacked the major oil town, which was taken by rebel forces on Saturday.
The BBC's John Simpson in Ras Lanuf said the rebels were experiencing a shortage of fuel, increasing their anxiety.