'Highly likely' criminals are responsible for horse meat contamination, FSA says Samples are now being tested for bute, a painkiller given to horses which can lead to serious blood disorders. The Food Standards Agency urged anyone who bought the products to return them to retailers, who will give them a full refund. Tesco also withdrew its Everyday Value spaghetti bolognese, which it said had been supplied by the same plant in France for five months. Aldi has withdrawn some of its frozen ready meal lines. Catherine Brown, the FSA's chief executive, told the BBC that it is now "highly likely" that "criminal and fraudulent activity" has been involved in the scandal. "I have to say that that the two cases of gross contamination that we see here indicates that it is highly likely there has been criminal and fraudulent activity involved," she said. We are demanding that food businesses conduct authenticity tests on all beef products, such as beef burgers, meatballs and lasagne, and provide the results to the FSA. The tests will be for the presence of significant levels of horsemeat. The FSA has come under fire after it said that it is the responsibility of producers to test food products rather than carrying out its own testing. Andrew Rhodes, of the FSA, said that "it is the responsibility of those making food and selling food to make sure it is exactly as described on the label." Anne McIntosh, Conservative MP for Thirsk and Malton and chair of the Food and Rural Affairs select committee told BBC Radio 4"s Today programme: "What is the FSA for? What is it doing? We were told by the farm minister that they are the police force...but they themselves have not found one case of contamination. The testing is done by the local authorities, or in this case the retailers as they should do on an ongoing basis. The FSA aren't doing any tests. The FSA has asked the retailers to do the tests," she added. Mrs Creagh has criticised ministers for not acting sooner. "The latest revelations take us to a whole new step in this scandal," she said. It's clear now that there is wide-spread criminal activity. The Irish government called in the police on Monday-Tuesday of this week. My question is why haven't UK Government ministers done the same? I want ministers to explain exactly what is happening. We had this announcement from the FSA late last night that there was a much more rigorous testing regime being applied to supermarkets. Why was that regime not started two or three weeks ago when this scandal broke? Owen Patterson, the Environment Secretary, has described the latest revelations as "completely unacceptable."