French war planes have reportedly destroyed four Libyan tanks, as the international operation against Colonel Gaddafi gets underway.
The UN has authorised air strikes to protect civilians in Libya.
Al Jazeera television is reporting the strikes took place to the south west of the rebel stronghold, Benghazi.
At a summit in Paris, world leaders have agreed on immediate military action to force him to respect a ceasefire.
British Royal Navy ships are involved in a naval blockade.