A U.S. Army helicopter hovers in front of the Pentagon in Washington after a Boeing 757 crashed into the building
The aftermath of the World Trade Centre which conspiracists say must have been demolished in a controlled explosion as it imploded so quickly without affecting other buildings
Emergency workers look for debris in Shanksville, near Pittsburgh, where the hijacked United Airlines Flight 93 crashed, killing all 45 people on board
TOP 9/11 CONSPIRACY THEORIES
1. Why did the world's most powerful airforce fail to intercept any of the hijacked planes?
What the conspiracists say: The US Vice President Dick Cheney ordered the military to stand down and not intercept the planes.
Official reports say: The transponder, which provides the exact location of the plane, had been turned off or changed.
There was a lack of communication between the civilian air traffic control (FAA) and the military and the military's equipment was outdated, designed to look out over the ocean to deal with a Cold War threat.
2. Why did the Twin Towers collapse so quickly, imploding without damaging surrounding buildings, after short fires on a few floors?
What the conspiracists say: The Twin Towers were destroyed by controlled demolitions.
Official reports say: The planes severed and damaged support columns and dislodged fire-proofing. About 10,000 gallons of jet fuel drenched the towers, starting the fires. Temperatures of up to 1,000C caused the floors to sag and the perimeter columns to bend, causing the sounds of explosions.
Controlled demolition is carried out from the bottom floors whereas this collapse started at the top.
3. How could an amateur pilot fly a commercial plane in a complicated maneuver, crash it into the Pentagon, 78 minutes after the first report of a possible hijack and leave no trace?
What the conspiracists say: The aircraft was not under the control of al-Qaeda but the Pentagon itself.
Official reports say: There is a large amount of video and still photography showing the plane wreckage and evidence of its flight path, such as broken lamp posts.
4. Why was the United Airlines flight 93 crash site at Shanksville, Pennsylvania, so small and why was the aircraft debris not visible?
What the conspiracists say: The plane was shot down by a missile and disintegrated in mid air, scattering the wreckage over a large area.
Official reports say: There are clear photographs showing aircraft wreckage and the cockpit voice recorder proved passengers had revolted and the hijackers had deliberately crashed the plane.
Another theory was based on a quote from the local coroner, Wally Miller, who said he stopped being a coroner after about 20 minutes because there were no bodies. But he also said he quickly realised it was a plane crash and there would have to be a large funeral service for the many victims.
5. How could the World Trade Centre 7 building, which was not hit by a plane, collapse so quickly (2.25 seconds) and symmetrically, when no other steel-framed skyscraper has collapsed because of fire?
What the conspiracists say: The building was destroyed by a controlled demolition using both explosives and incendiaries.
Owner, Larry Silverstein, was heard saying 'pull it' in a TV interview but he was talking about pulling firefighters back.
Some scientists examined four dust samples from Ground Zero and claim to have found thermite, a material which reacts when heated up, and that had been explosives rigged inside.
Official reports say: The building collapsed because of uncontrolled fires, started by the collapse of the nearby North Tower, which burnt for seven hours.
The mains water feeding the emergency sprinkler system was severed.
The thermitic material is a type of primer paint.
SOURCE: BBC
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