The allegations have been plaguing the Heathrow climate camp all week. They began in the Evening Standard: "Hoax bombs to cause alerts. Assaults on airport fence ... Protest leaders calling themselves 'The Elders' advised 'clashes with police will happen'."
When I was asked on to Newsnight to discuss the issue of whether climate change is a greater threat than terrorism, we kept being dragged back to the hoax bombs. The story was later picked up across the media, including appearances in the Daily Mail and the Telegraph, and by Friday had been embellished with some lurid new quotes from the Metropolitan police in the Daily Express, which warned: "Extremist yobs hijack airport demo in plot to cause mayhem".
All this has left us at the protest camp scratching our heads. The actions planned for tomorrow have been discussed openly at huge meetings. But nothing even resembling the schemes proposed by the Evening Standard has even been mooted. The campers will certainly be breaking the law by taking direct action - all protests can now be deemed unlawful - but they will be governed by strict non-violent principles.
There are quite a few of us veterans here but age, sadly, confers no privileges: the camp is non-hierarchical, and no one has heard of "The Elders". There are plenty of anarchists, but the last thing they want is a ruck with the police, not least because - armed with nothing more than a sheaf of scientific papers - they would lose. As for scaling the perimeter fence, it has been ruled out on the grounds that we would probably be shot. Invading Heathrow's massive runways would put the lives of thousands at risk.
So where did the story come from? It was, or so the byline claimed, written by Robert Mendick, the Evening Standard's chief reporter. One of the campers phoned Mr Mendick and asked him what was going on. "I'm very constrained about what I can say for various reasons," Mr Mendick replied. "Suffice to say I understand what you're saying and I can't go into it. Er, and I would further say it's, er, not something I was actually massively involved with and, er, I'll leave it at that." "What do you mean?" "... I really can't go into it."
So what does he mean? Why is Mr Mendick unable to say where the claims in his story came from? How did he manage to write an article that he was not "massively involved with"? Is there a computer programme at the Evening Standard that composes reporters' articles on their behalf? I left messages for Mr Mendick yesterday but was unable to speak to him.