1NATO spy planes today launched a 24-hour air space surveillance over Libya, with British defence secretary Liam Fox hinting that a no-fly zone could be enforced without elimination of the North African nation's air defences. The surveillance was activated around noon today and came in the wake of Libyan air force fighters carrying out the heaviest bombing of rebel positions at Ras Lanuf in the east. As indications of a 'no fly zone' being enforced by US and NATO combine military action grew stronger, the British defence secretary said that a no-fly zone over Libya was possible without hitting at Libyan air force bases and air defence systems. This contrasted with comments by US defence secretary Robert Gates. According to Fox a no-fly zone like the one enforced over Iraq between 1991-2003, could also be imposed over Libya.