( also the Twin Towers )
two very tall office buildings in Manhattan (1), New York City, built by the Port Authority of New York and New Jersey in 1972–3. For a short time they were the tallest buildings in the world. Each was 1 350 feet/412 metres high and had 110 floors. A terrorist bomb exploded in the Center in 1993 killing six people and injuring more than a thousand. On September 11th 2001 the Twin Towers were both destroyed in another terrorist attack. Two planes crashed into the towers, and a short time later both towers collapsed. The area where the building used to be is now called Ground Zero . A memorial to the victims of the attack is planned for the site.
See also September 11 .