The car-bombing involved 12,000 lbs of TNT

The suicide bomber steered a truck loaded with TNT - He plowed into the four-story barracks where more than 300 U.S. troops from a U.N. peacekeeping mission slept and detonated what the FBI called the largest non-nuclear bomb in history

Members of Hezbollah (supported by Iran and Syria) carried out the attack - there are reports that the attack was planned by a man who wound up inspiring bin Laden.