Libyan rebels have deployed tanks, artillery and a helicopter to repel an attack by pro-Gaddafi forces on the key town of Ajdabiya. AP news agency reports that pro-Gaddafi forces have surrounded Ajdabiya on three sides. Government forces however say they have taken over Ajdabiya and an attack on Benghazi, 160 kms away, is imminent. According to a report from the rebel stronghold of Benghazi, this is the first time that rebels have faced government forces.UN Security Council is expected to vote on action in Libya. The US now favours imposing a no-fly zone over Libya, and even taking further measures, to halt the advance of pro-Gaddafi loyalists. Russia expressed concern at some of the implications of the proposals and has put forward a counter-resolution.