The answer is actually "The attack on the World Trade Center." on February 26, 1993, 6 people died, but hundreds of others were injured and sent to the hospital in critical conditions. More than a thousand people were injured that day. The World Trade Center itself suffered more than $500 million in damage. After the attack, authorities evacuated 50,000 people from the buildings.
The United States and the Soviet Union came to the brink of nuclear war in 1962 over Soviet missile bases in Cuba. This was referred to as the "Cuban Missile Crisis". The US was mostly concerned about the very close proximity of the missiles to its shores.