t is 20 years since the 9/11 terror attacks which devastated New York and shocked the rest of the world.

On September 11, 2001 a series of four terror attacks took place against the US, including two hijacked planes that crashed into the World Trade Center.

Islamic terrorist group al-Qaeda claimed responsibility for the attacks.

Two decades on, the city of New York has reopened the Cortlandt Street subway station, which was buried under debris when the World Trade Centre collapsed.

Elsewhere in the US city, there are reflective reminders of the attacks, such as Ground Zero, which pays tribute to those who lost their lives.

Here, we take a look back at the numbers behind the 9/11 tragedy:

Victims killed in the attacks: 2,977

The age range of the victims:2-85

Number of British victims: 67

Percentage of victims who were men:70-80

The number of minutes respectively each tower stood burning: 56, 102

Nations who lost citizens killed in the attacks:115

The number of seconds the towers took to fall:12

The maximum heat of fires, in degrees Fahrenheit, at World Trade Center:2,300

The number of survivors rescued from ground zero:0

The estimated speed of flight 175 in mph as it crashed into the South tower: 590

Days underground fires at the World Trade Centre continued to burn:69

Death certificates issued without a body at the request of victims’ families: 1,616

Days the New York stock exchange was closed: 6

World Trade Center victims’ remains that have been positively identified (out of 2,753): 1, 642

Hours taken to clean up 1.8 million tons of debris:3.1 million

Estimated amount of money it cost to plan and execute the attacks:$500,000

Estimated cost of World Trade Center site damage: $60 billion

The percentage by which PTSD increased in New Yorkers after 9/11: 200

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