1 WTC also supported a 360 foot tall (110 m) antenna. Both had 110 stories, although 1 WTC was 1,368 feet (417.0 meters) tall and 2 WTC was 1,362 feet (415.1 m) tall. 1 and 2 WTC were nearly identical structures. No conclusive reason for the collapse has ever been established, however NIST's working hypothesis is that the collapse was the result of structural damage sustained during the collapse of Towers 1 and 2, combined with widespread fires in the building.Ĭonstruction of the towers began in 1968 and was completed in 1970 (1 WTC) and 1972 (2 WTC). It did add, however, that the towers' stairwell design lacked adequate reinforcement.ħ WTC collapsed at 5:20 pm, with no casualties. In its September 2005 report, the National Institute of Standards and Technology (NIST) concurred with this view, noting that the severity of the attacks and the magnitude of the destruction was beyond anything experienced in US cities in the past. The Federal Emergency Management Agency (FEMA) issued a performance study of the buildings in May 2002, declaring the WTC design sound and attributing the collapses wholly to extraordinary factors beyond the control of the builders. In all, 2,595 people inside and near the towers were killed, along with the 157 people who were aboard the flights. 2 WTC collapsed to the ground at 9:59 am, less than an hour after being hit, and 1 WTC followed at 10:28 am, causing massive damage to the rest of the complex and nearby buildings. On September 11, 2001, the two main towers of the World Trade Centre complex were each hit by hijacked commercial aircraft as part of the Septemattacks.
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