This was followed by the National Institute of Standards and Technology's three-year investigation, funded by the US Federal Government and published in 2005. The investigatory reports into the events of Septemwere undertaken by the US Federal Emergency Management Agency (FEMA) and the National Institute of Standards and Technology.įEMA's report was published in 2002.
Most high-rise buildings since have used a similar structure. They were constructed from steel and concrete, using a design that was groundbreaking at the time. Construction on the World Trade Center 1 (the North Tower) and World Trade Center 2 (the South Tower) began in the 1960s.
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