An inspector on the mosque site's roof noticed the debris, which includes a clearly visible Boeing Co. identification number, police spokesman Paul Browne said.

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The government inspector visited the planned site in Leighton on Monday.

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David Hardy, for the developers, said the inspector fully understood the significance of the site and in the absence of any planning error it was difficult to see how he could have reached a different conclusion.

BBC: Lyveden New Bield

The officer in charge of the investigation, Detective Inspector Tim Dowdeswell, told the Today programme that some clients of the site, called Confidential Access, went on to commit major frauds of their own.

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Bristol City Council went against the inspector's original recommendation for the land and said only the southern part of the site should be made into a town green, which would have allowed the stadium development to go ahead.

BBC: Ashton Vale: Inspector to report on town green status