Libya: Rebels face attack as UN mulls no-fly zone

Col Muammar Gaddafi's forces are slowly pushing towards the main rebel-held towns in Libya, reports say.

Ajdabiya, the last major town before the rebel base in Benghazi, came under heavy aerial attack.

In the west, ground forces and tanks have begun shelling the town of Zuwara.

Rebels say they have retaken Brega, but the government has denied the claim.

Meanwhile, Russia has said serious questions remain about a no-fly zone, after a UN security council meeting.

Jon Leyne reports.