When Cynthia McKinney speaks the words of Martin Luther King Jr, they resound through the church with some of King’s cadence. “A time comes,” declares the former US congresswoman from Georgia, “when silence is betrayal.” The congregation answers with whoops and calls of “That’s right!” King was talking about America’s war in Vietnam. More than 40 years later, before the packed pews of the Immanuel Presbyterian Church in Los Angeles, McKinney is speaking of the American government’s war on its own people. The shock and awe phase of this conflict, we had been told earlier, began on September 11 2001, when the Bush administration launched attacks on New York and Washington, or at least waved them through.

According to a show of hands that February afternoon, several hundred people in the immaculate church believe this to be true. Some came in T-shirts bearing the words “9/11 was an inside job”. One wore a badge demanding that you “Examine your assumptions”. Quite a few bought the DVDs on sale in the foyer, most of which bore photographs of the Twin Towers spewing smoke. They had all come to hear the message of Architects, Engineers & Scientists for 9/11 Truth, one of the dozens of groups across the US which campaign to persuade us that everything we think we know about 9/11 is wrong.

Last winter, “Investigate 9/11” banners seemed to be popping up all over the place. Bill Clinton was heckled by “truthers” in Denver while campaigning for his wife. Truthers picketed the Academy Awards in LA – despite this year’s winner of the best actress Oscar, Marion Cotillard, reportedly being one of them. But then, she’s French. Literature lovers in that country pushed Thierry Meyssan’s L’Effroyable imposture (The Appalling Fraud) – which asserts that 9/11 was a government plot to justify invading Iraq and Afghanistan and increase military spending – to the top of the bestseller list in 2002.

Country music star Willie Nelson is assuredly not French, but a week or so before the Oscars he described as naive the notion that the “implosion” of the Twin Towers was caused by crashing jets. Meanwhile the European Parliament screened the Italian documentary Zero, in which Gore Vidal, Italian playwright Dario Fo, and Italian MEP Giulietto Chiesa blame the US government, not al-Qaeda, for 9/11. The following month, Japanese MP Yukihisa Fujita raised his own doubts about the official story at a seminar in Sydney. A busy season for the “9/11 Truth” movement.

The events of 9/11 were recorded in many thousands of images, from crisp agency photographs to amateur camcorder footage. Every recorded trail of smoke, every spray of sparks is pored over by an army of sceptics, collectively described as the 9/11 Truth movement. They believe that the key to the mystery is hidden somewhere within the pictures, just as some people think that clues are contained in the Zapruder film which captured the moment of John F. Kennedy’s assassination. Allied against them is a smaller group of rival bloggers who have taken it upon themselves to debunk what they claim are dangerous conspiracy theories. There is some evidence that the truthers are swaying the rest of us. A New York Times/CBS News poll in 2006 revealed that only 16 per cent of Americans polled believed the Bush administration was telling the truth about 9/11. More than half thought it was “hiding something”. This is not the same as believing the government actually launched the attacks, but a Scripps Howard/Ohio University poll the same year found that more than a third of those questioned suspected that federal officials assisted in the attacks or took no action to stop them so that the US could go to war.

The truthers certainly believe that they are on a roll. The crowd in the Immanuel Presbyterian Church seemed electrified. As the donated sound system pumped out angry rap, a giant video screen showed images of protesters demanding a new investigation into 9/11. The symbols and the language were borrowed from the civil rights struggle, but the truthers are an eclectic group, including anti-Bush, anti-war liberals and anti-government libertarians. A young man in a “Vote Ron Paul” T-shirt scuttled through the hall, filming us as we took our seats on wooden pews.

First up was Richard Gage, a San Francisco architect who founded Architects, Engineers & Scientists for 9/11 Truth, which now claims to have 379 professional members. Gage told us that the collapse of the Twin Towers could not have been due merely to gravity, the impact of the airliners and the resulting jet fuel fires – which would not have been hot enough to weaken the steel sufficiently. Behind him on the video screen was the south tower of the World Trade Center. Smoke poured from its upper floors. A respectful silence fell over the audience, followed by gasps as the building appeared to dissolve before our eyes. While I have seen this footage countless times, it seems that I had clearly never understood what I was seeing. The destruction of the Twin Towers, along with the collapse of the nearby 47-storey World Trade Center 7 building, had all the hallmarks of controlled demolition, according to Gage. They all came straight down, almost at the speed of a free-falling object, right into their own footprints. Steel-framed buildings had never collapsed because of fires before. On this day three did, one of which, “Building 7”, was not even hit by an aircraft.

Gage, who had worked himself into a fever, exhorted the audience to stand up and be counted: “A country is at stake.” Then he welcomed on to the stage the star of the evening, Steven Jones. A softly spoken physicist, Jones is the movement’s designated martyr and seems to promise what the truthers so desperately need: scientific credibility.

Jones entered into truther lore in 2006 when he was put into early retirement by Brigham Young University in Utah after giving public lectures on his paper “Why indeed did the WTC buildings collapse?”, which he published on the website of the university’s physics department. Jones contended that the towers were demolished by cutter charges which had been placed throughout the buildings, probably involving an incendiary called thermite. BYU’s College of Physical and Mathematical Sciences and the structural engineering faculty, followed by the university administration, disowned him.

Still, Jones is no fool. He has published more than 50 scholarly papers, including pieces on cold nuclear fusion in journals such as Scientific American and Nature. He invented a cooker which uses solar power and has donated models to poor families in the developing world. Jones tells us he believes laboratory testing of dust from Ground Zero will reveal residue from a thermite reaction.

As soon as the seminar is over, Jones is mobbed by people asking him to pose for photos and offering their own views on the 9/11 plot, as well as others such as the presence above our heads of chemtrails (deadly toxins sprayed by unidentified aircraft, which some believe are part of a secret global depopulation programme). This is the world Jones now inhabits – it seems a long way from a Utah physics department. I ask him later by phone if he has any regrets about publishing that fateful paper: “No regrets. I’ve thought of Galileo a few times. He got a little worse than I did, I suppose.”

Jones is typical of many 9/11 researchers in that the subject has taken over his professional life. Down the coast in Santa Barbara is another of the movement’s luminaries. On the beach at Isla Vista, one of the most expensive real-estate spots in the US, lives David Ray Griffin, a former theology professor. As his dogs scratch excitedly on the sliding door, Griffin explains that America’s primary faith is not Christianity, but nationalism. “Other countries do really terrible things. Our leaders never would. And that [belief] has been the biggest impediment to getting people to look at the evidence, because they just know a priori that that is ridiculous.”

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