Libya: Government and rebels still battling for Brega
The oil town has changed hands several times over recent days. Reports now suggest the rebels are losing control.
In the west, government forces appear to have retaken Zuwara and are shelling Misrata city.
Meanwhile, Britain and France tabled a draft resolution at the UN Security Council that would ban all flights over Libya to prevent Tripoli's air attacks.
However, there is still a lot of opposition, and not only from the Russians and Chinese, which traditionally oppose military intervention, the BBC's Barbara Plett at the UN reports.
Germany too has said there are many unanswered questions, and the Americans have not declared their position, our correspondent says.
On Tuesday, Libyan government planes also bombed the outskirts of Ajdabiya, the last town before the rebel base in Benghazi in the east.
The sound of rocket fire has been getting louder in the town, while the frequency of ambulances and trucks bringing wounded to the main hospital has been increasing, AFP news agency reports.
Libyan state TV says the government has gained control of the town, but this has not been independently verified, and reports suggest that fighting is continuing.
Libyan leader Col Muammar Gaddafi addressed his supporters in Tripoli, describing the rebels as "rats;" Kazinform cites BBC News.
See www.bbc.co.uk for full version