The current conflict in Libya started in mid-February, when opposition forces called for the resignation of Col. Moammar Gadhafi, a constitution and other reforms. After his concessions are rejected, the North African leader uses brutal means to suppress protests. As rebels gain control of more cities, Gadhafi fights back with air strikes. World leaders condemn Gadhafi and call for him to step down. He refuses. The United Nations establishes a no-fly zone over Libya, which allows U.S.-led coalition forces to shoot down Libyan aircraft.