As searches continued at addresses across northern England, the prime minister, Gordon Brown, described the suspected plot as "very big" and said investigators were examining links with Pakistan.
He cites research by Professor Tom Humphrey at Bristol University, examining links between stocking densities and campylobacter - a serious food-poisoning bug affecting 30,000 people a year in Britain, at one time detected in 50 per cent of chickens.
It also emerged last week that Surrey police were examining links between Milly's murder and the hunt for the killer of 22-year-old French student Amélie Delagrange, who was found bludgeoned to death on Twickenham Green, in south-west London last August.
Pearl, the Wall Street Journal's South Asia bureau chief, was kidnapped when examining links between Pakistani extremists and the so-called "shoe bomber" Richard Reid, who was arrested in December on a Paris-Miami flight he is alleged to have boarded with explosives in his trainers.
With the FBI examining links between disgraced former Brazilian football chief Ricardo Teixeira and embattled Fifa secretary general Jérôme Valcke, the investigation now encompasses three of the past five World Cups and the controversial award of the next two tournaments in Russia and Qatar.
The report said one line of inquiry had been examining links to Mr. Tatlises's business dealings and alleged ties to organized crime, while the other had been looking into a possible political background connected to the Kurdish issue and the recent elections in Turkey.
