One of the food companies at the centre of the horsemeat scandal said on Saturday evening that it was considering taking legal action against its suppliers as the environment secretary warned that there may be more cases of contaminated meat to come.

Owen Paterson said that results from tests on all retailers' and manufacturers' processed beef products could see further traces of horse meat being found.

He expressed concern that an international criminal conspiracy was taking place and made it clear the Government will work with authorities anywhere to ensure appropriate measures are taken.

Frozen foods firm Findus, which has taken its beef lasagnes off shelves after some were found to have up to 100% horse meat in them, said it was looking into legal action as an internal investigation "strongly suggests" that the contamination "was not accidental".

The company said in a statement: "Findus is taking legal advice about the grounds for pursuing a case against its suppliers, regarding what they believe is their suppliers' failure to meet contractual obligations about product integrity."

Paterson spoke after attending an emergency meeting with bosses from leading supermarkets, trade bodies and the Food Standards Agency (FSA) to discuss the scandal which has seen chains including Tesco, Lidl, Aldi and Iceland withdraw some of its products.

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Paterson: 'More bad results coming...'

The FSA have now asked retailers and processors to test all their processed beef products to make sure they are what they say they are.

"There may well be more bad results coming through, that's the point of doing this random analysis," Mr Paterson said.

He said retailers hold the "ultimate responsibility" for making sure that horse meat is not in their products and that the supermarkets and trade bodies at today's talks had agreed to look into how they can improve their existing regimes and have already begun plans to carry out more testing and report their results on a quarterly basis.

He said it was down to retailers to visit manufacturers and make sure they stick to the proper protocols to be sure themselves that the materials going into their products are what they are meant to be.

They had also agreed that consumers should be compensated if they have bought withdrawn products with no questions asked, he said.

Paterson added: "It's a question of either gross incompetence, but as I've said publicly and I'll repeat again, I'm more concerned there's actually an international criminal conspiracy here, and we've really got to get to the bottom of it.

"If there's a criminal act we will work with the authorities wherever they are to ensure the appropriate measures are taken.

"This is a conspiracy against the public. Selling a product as beef, and including a lot of horse in it is fraud."

Bosses from supermarkets including Tesco, Sainsbury's, Asda and Morrisons attended the meeting at the Department for Environment, Food and Rural Affairs (Defra) in London after the issue last night became a police matter as Scotland Yard announced they had met representatives from the FSA, although there is currently no official police investigation.

Asked if there were any plans to test for traces of other meats, such as dog, the environment secretary said: "It may be very isolated, it might be a small number of suppliers involved in the horse trade we don't know, but I think that as we progress and we'll know more over the course of the next few weeks, we can decide what to do next."

Questioned about whether he would be prepared to eat meat bought from a supermarket, he said: "I would be very happy to eat any products on sale in British supermarkets this morning, but I would not recommend anyone to eat a product which has been withdrawn."

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Prime Minister David Cameron described the matter as "shocking" and "completely unacceptable", while Labour leader Ed Miliband said it was "appalling".

He added: "I think people in the country will be quite shocked that horse meat has been in the food that they have been innocently buying.

"The Government has got to get a grip on this situation."

The Trading Standards Institute has said the discovery of such high levels of horse meat suggests "deliberate fraudulent activity".

Food safety experts have said there is no risk to public health.

Findus said it carried out a full product recall on Monday, two days before DNA tests found that some of its lasagnes contained up to 100% horse meat.

The firm, which has its headquarters in London, tested 18 of its beef lasagne products, made by French food supplier Comigel, and found that 11 contained in the range of 60% to 100% horse meat.

Tesco and Aldi have also withdrawn a range of ready meals produced by Comigel over fears that they contained contaminated meat.

The GMB union said all hospitals, schools and meals-on-wheels services should verify that horse meat had not been served to vulnerable people.

Responding to fears that school dinners might be contaminated with horsemeat, the Department for Education said schools and councils were responsible for their food contracts.

A spokeswoman for the Local Authority Caterers Association (Laca) said: "We are as sure as we can be that this is not affecting the school catering area."

She added that there were "strict guidelines" around food safety and supplying dinners in schools, including transparency and traceability of ingredient provenance, written into contracts.

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  • Horse meat found in beef products

    Secretary of State for Environment, Food and Rural Affairs (Defra) Owen Paterson, left, speaks to the media outside Defra Headquarters in London, Saturday Feb. 9, 2013, after an emergency meeting with the Food Standards Agency (FSA) and representatives of various leading retailers, as revelations about the widespread use of horseheat in supermarket beef products continues to hit consumer confidence. Concerns about the use of horsemeat burst into the spotlight earlier this year, after it emerged that some beef products contained horse DNA, and now the whole industry faces pressure to test their products and reveal the findings. (AP Photo / John Stillwell, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Horse meat found in beef products

    Secretary of State for Environment, Food and Rural Affairs Owen Paterson speaks to the media outside Defra Headquarters, London, after after meeting with representatives of the food industry.

  • Horse meat found in beef products

    Federation of Wholesale Distributors Chief Executive James Bielby arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Institute of Grocery Distributors Chief Executive Joanne Denney-Finch arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Sainsbury's Director of Brand Judith Batchelar arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Institute of Grocery Distributors President Fiona Dawson arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Food and Drink Federation Director General Melanie Leech arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    ASDA Corporate Affairs Director Paul Kelly arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Morrisons Chief Executive Dalton Philips arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    Tesco Technical Director Tim Smith arriving at an emergency meeting with the Food Standards Agency (FSA) and retailers, at Defra headquarters in London, as ministers warn of a "criminal conspiracy" at the heart of the horse meat scandal.

  • Horse meat found in beef products

    British Meat Processors Association Director Stephen Rossides arrives for an emergency meeting with the Food Standards Agency (FSA) and representatives of various leading retailers, at the government food and farming department, Defra, headquarters in London, as information is released revealing the widespread use of horseheat in supermarket beef products. Concerns about the use of horsemeat burst into the spotlight earlier this year, after it emerged that some beef products contained horse DNA, and now the whole industry faces public pressure to test their products and reveal the findings. (AP Photo / John Stillwell) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES