Libya revolt: Sirte
Pro- and anti-government forces have been battling for ground in Libya. Explore the map below to find out more about the key flashpoints.
Col Gaddafi's well-defended hometown remains under government control and is seen as a major obstacle to rebels attempting to move west.
The closer rebels get to Col Gaddafi's tribal stronghold, the more sophisticated is the equipment used by the pro-Gaddafi forces, says the BBC World Affairs Editor John Simpson.
But if Sirte fell, the road to the anti-Gaddafi towns of the north-west would open up, he added.