Supermarkets have been forced to withdraw egg-based products after it emerged that 700,000 potentially contaminated eggs were imported to the United Kingdom - 30 times more than the regulator had previously said.
In large quantities, fipronil, is considered to be "moderately hazardous" according to the World Health Organisation, and can have risky affects on people's kidneys, liver and thyroid glands.
The food regulator claimed on Monday that only 21,000 had been imported from implicated farms.
It emerged today that this was a false assurance and that potentially contaminated products were still being...
The FSA said it had no evidence that eggs laid in the United Kingdom are contaminated or that Fipronil has been used inappropriately here. It is "very unlikely" there is any risk to public health, the FSA said.
The U.K.'s food agency on Thursday admitted that more tainted eggs linked to a European food scare have been imported than previously estimated.
Luxembourg has since alerted food safety authorities about the incident via the European Union rapid alert network.
The French minister also criticised the two countries, where eggs were contaminated with the insecticide Fipronil, for not informing France earlier about the problem.
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Dutch authorities arrested two men Thursday on suspicion of involvement in the illegal use of the pesticide Fipronil in poultry farms.
A Morrisons spokeswoman said: "100 per cent of our whole eggs are British and none of these eggs are affected".
The Netherlands is one of the largest exporters of chicken eggs in the world.
Testing of eggs on farms is under way across the United Kingdom and results to date for England and Wales show no exposure to Fipronil.
'We have now established that more eggs from affected farms than previously identified came to the UK.
Authorities are now investigating how the insecticide illegally came into contact with poultry.
Germany and the Netherlands have also accused Belgium of failing to disclose contamination, even after it began showing up in tests, resulting in later unnecessary recalls, though Brussels says it did not intend to cover up the incident.
It is thought that fipronil was added to an allowable treatment for red mites.
British Lion Egg Processors chairman Ian Jones said: "Consumers clearly want retailers and food manufacturers to use good quality British ingredients that are produced to high standards of food safety".