The Peter Boddy Licensed Slaughterhouse in Todmorden has been raided by Food Standards Agency representatives in connection with the horse meat scandal.
The plant is believed to have supplied horse carcasses to Farmbox Meats Ltd in Aberystwyth.
The Agency and the police are looking into the circumstances through which meat products, purporting to be beef for kebabs and burgers, were sold when they were in fact horse.
The FSA has suspended operations at both these plants. Both West Yorkshire and Dyfed-Powys police have entered the premises with the FSA.
The FSA has detained all meat found and seized paperwork, including customer lists from the two companies.
Peter Boddy said he will co-operate with Food Standards Agency and denied officers had “raided” his premises.
He said the agency are welcome to visit whenever they wanted and just wanted to see his records, which he will be showing them.
He added that he does slaughter horses at his plant and that the meat is sold as such in the UK.
Andrew Rhodes, FSA Director of Operations, said: ‘I ordered an audit of all horse producing abattoirs in the UK after this issue first arose last month and I was shocked to uncover what appears to be a blatant misleading of consumers. I have suspended both plants immediately while our investigations continue.’
Environment Secretary Owen Paterson said: ‘This is absolutely shocking. It’s totally unacceptable if any business in the UK is defrauding the public by passing off horsemeat as beef. I expect the full force of the law to be brought down on anyone involved in this kind of activity.’