Libyan revolutionary forces are now closing in on the key oil town of Brega.
Forces loyal to Libyan ruler Muammar Gaddafi appear to be putting up no resistance to the advance by the revolutionaries.
It is believed government forces fled as the rebel forces got within a distance of eight kilometers from Brega.
On Sunday, Gaddafi regime forces ambushed the revolutionaries, forcing a retreat.
The oil town of Brega has changed hands for a seventh time in six weeks.
It has recently come under heavy assault by pro-regime forces.
Meanwhile, the US has said it will conduct airstrikes on Libya throughout Monday, following a request from NATO.
The Pentagon has said the raids are an effort to protect civilians from Gaddafi’s forces.
NATO has said it will take the lead from Tuesday.