Libyans celebrated their liberation with mass demonstrations in Benghazi yesterday, the 28th anniversary of another landmark event in Middle East history. On Sunday, 23 October 1983, at 6.22 a.m., a suicide bomber rammed a truck into the US Marine Corps barracks at Beirut Airport and detonated what FBI forensics specialists would later describe as the largest conventional explosion in history. Two hundred and forty-one American service personnel died. A similar assault in Beirut that morning killed 58 French troops. The perpetrators were undoubtedly members of the nascent Hizbullah movement.