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In 2011, US commemorates 10 years since 19 al-Qaeda terrorists hijacked three passenger planes and ploughed them into the Twin Towers and the Pentagon. A fourth passenger plane allegedly heading straight for Capitol Hill or the White House crashed in a field in rural Pennsylvania, killing all onboard. 2,993 people were killed and thousands injured in the co-ordinated attacks.

9/11 (September 11, 2001) marked one of the biggest news events in modern history and almost everyone will remember where they were when the story broke.

9/11: 20 people were pulled from the rubble alive

According to Yahoo! there are nine surprising things people may not have known about 9/11:

1. 20 people were pulled from the rubble alive

According to 9/11 research on World Trade Center survivors, 20 people were pulled from the rubble alive. Among the survivors were John McLoughlin and William Jimeno, two Port Authority policemen, who were rescued after being buried in debris around a freight elevator for about 13 and 21 hours. They were the subject of the 2006 Oliver Stone film ‘World Trade Center.’

Pasquale Buzzelli, a structural engineer for the Port Authority, and Genelle Guzman, a secretary, were in offices on the 64th floor of the North Tower when the building was hit. Buzzelli was knocked unconscious for three hours, and awoke on a hill of rubble, looking at the sky. Suffering from a broken foot, cuts and a concussion, he was removed by rescue workers and evacuated on a stretcher. Guzman, who was just below the surface, was rescued more than 27 hours after the Tower fell. Her leg was crushed but she fully recovered within four months.

2. Second biggest loss of life – the British nationality people

It wasn’t just Americans who fell victim to the attacks at both the World Trade Center and The Pentagon. More than 80 nationalities suffered at least one loss from the day’s horrific events, including Japanese, Irish, British, Australian, New Zealanders, Swiss, Indian, Mexican, Brazilian, South African and Canadian. Out of 372 foreign fatalities, 67 people of British nationality died.

3. Ron DiFrancesco managed to escape from collapsing South Tower

37-year-old Canadian DiFrancesco was escaping the World Trade Center South Tower as the second plane hit between the 77th and 85th floors, immediately throwing him against the wall on impact. After making a difficult descent to the ground floor, DiFrancesco managed to exit the building – which then collapsed behind him.

Engulfed in a fireball, DiFrancesco woke in hospital days later with lacerations on his head, burns all over his body and a broken bone in his back. After his miraculous escape he was one of only four people to escape from above the South Tower 81st floor.

9/11: fires raged for 99 days

4. Fires raged for 99 days

It took 99 days for the fires at Ground Zero to be extinguished completely. At 8.46am on 11 September the fires started as the first plane hit the North Tower. The remaining fires were eventually put out on 19 December.

5. A third skyscraper fell down

A third skyscraper World Trade Center (WTC) Building 7 – a 47-story building and one of the largest in downtown Manhattan fell during the attacks. It went largely unnoticed in the media because it hadn’t been hit by a plane. It is commonly believed that ‘ancillary damage’ from the collapses of the Twin Towers led to the collapse of WTC Building 7.

The 9/11 Commission Report states: “The total collapse of the third huge skyscraper late in the afternoon September 11th was reported as if it were an insignificant footnote… most people never saw video of Building 7’s collapse… Incredibly, it is virtually impossible to find any mention of Building 7 in newspapers, magazines, or broadcast media reports after September 11th.”

6. Code messages were sent out online by 9/11 conspirators

It is claimed that one of the 9/11 conspirators – Abu Abdul Rahman – sent a coded love post on an Internet chat room to his “German girlfriend” weeks before the attack, who turned out to be fellow 9/11 conspirator Ramzi Binalshibh.

The message allegedly read: “The first semester commences in three weeks. Two high schools [Twin Towers] and two universities [Washington DC targets] … This summer will surely be hot …19 [the eventual number of hijackers] certificates for private education and four exams [the number of planes used]. Regards to the professor. Goodbye.”

CNN reports that about three weeks before 9/11, targets were assigned to four teams, with three of them bearing a code name. The US Capitol building was called ‘The Faculty of Law;’ the Pentagon became ‘The Faculty of Fine Arts;’ and the North Tower of the World Trade Center was code-named as ‘The Faculty of Town Planning.’

7. One company – Cantor Fitzgerald – lost 2/3 of its workforce

Global financial services firm Cantor Fitzgerald was the worst business affected by the 9/11 attacks. Unfortunately, its New York headquarters based on the 101st and 105th floors at One World Trade Center lost 658 out its 960-strong workforce – which amounted to two third of its total NYC staff.

After the tragedy hit, CEO Howard Lutnick called a colleague and said: “We could shut the firm and attend our friends’ funerals, or we’re going to work harder than we’ve ever worked before to help their families.” And that’s exactly what they did. Ten years later, Cantor Fitzgerald has handed out more than $180 million (£109 million) to the families of the deceased staff and has fulfilled its promise to pay their health care.

9/11: World Trade Center steel was sold on

8. World Trade Center steel was sold on

What did the US authorities do with the 185,101 tons of steel left at Ground Zero? They recycled it. The American public was outraged because authorities removed the steel before it was properly tested for evidence. Mayor Bloomberg responded by saying: “If you want to take a look at the construction methods and the design, that’s in this day and age what computers do. Just looking at a piece of metal generally doesn’t tell you anything.”

According to the ‘9/11 Research’ Website, the bulk of the steel was shipped to China and India. The Chinese firm Baosteel purchased 50,000 tons at a rate of $120 (£73) per ton. The rest of the steel was used for memorial material across all 50 states.

9. Plane engine survives crash

In the wake of the attacks, engineers volunteered to investigate the structural responses of the WTC buildings. According to Federal Emergency Management Agency (FEMA), a single engine from one of the planes that struck the Twin Towers miraculously survived the plane crash and the explosion and collapse of the Towers.