On the morning of Feb. 26, 1993, a massive truck bomb ripped a hole almost 30 meters (100 feet) across the B-2 level of the parking garage beneath the World Trade Center's North Tower. The blast wave was so powerful that it penetrated five stories of the reinforced concrete building. In addition to causing structural damage, the explosion destroyed or heavily damaged hundreds of vehicles in the garage. That such a powerful explosion killed only six people is nothing short of a miracle, for the attackers had a goal much more grandiose. They wanted to topple the North Tower onto the South Tower to destroy them both and kill thousands. Had a device of the same magnitude been detonated at street level during rush hour, it would have likely killed scores if not hundreds of people and wounded perhaps thousands more.