On this day, September 11, in 2001, 18 years ago, the United States suffered what is now considered the deadliest terrorist attack in human history.
Terrorists on Tuesday, September 11, 2001, crashed hijacked aeroplanes into the World Trade Centre in New York City.
The attack, according to CNN, was orchestrated by Al Qaeda leader Osama bin Laden.
At the World Trade Center (WTC) site in Lower Manhattan, 2,753 people were killed. Among those who were killed during the attacks were 343 New York City firefighters, 23 New York City police officers and 37 port authority officers.
The victims ranged in age from two to 85 years old. Approximately 75% to 80% of the victims were men.
At the Pentagon in Washington, 184 people were killed when hijacked American Airlines Flight 77 crashed into the building.
As of July this year, 1,644 (60%) of 2,753 WTC victims' remains have been positively identified, according to the medical examiner's office.
Apart from the huge number of lives lost, the terrorist attack also had serious economic consequences.
CNN reports that an estimated economic loss of $123 billion was recorded during the first two to four weeks after the World Trade Center towers collapsed. There was also a decline in airline travel over the next few years.
The estimated cost of the WTC site damage was $60 billion, including damage to surrounding buildings, infrastructure and subway facilities.
The ugly development also forced the US congress to approve $40 billion for emergency anti-terrorism package on September 14, 2001. A sum if $15 billion was also approved by the congress as aid package to bail out the airlines.
Insurance claims arising from the attacks were up to $9.3 billion
It was estimated that it also cost the terrorists $500,000 to plan and execute the 9/11 attacks.
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