British authorities have raided a slaughterhouse and a meat processing company suspected of selling horsemeat labelled as beef, shutting them down temporarily and seizing all the meat found.

Tuesday’s raid by the Food Standards Agency (FSA) was the first time since the growing scandal broke across Europe that horsemeat being marketed as beef has been traced to suppliers in Britain, officials said.

The FSA said it suspended production at the Peter Boddy slaughterhouse in Yorkshire, in the north of England, and a company it allegedly supplied horse carcasses to, Farmbox Meats, in west Wales.

The agency said it was investigating how “meat products, purporting to be beef for kebabs and burgers, were sold when they were in fact horse”.

Millions of burgers and frozen meals have been recalled around the continent and while many accusations have been made, it is unclear how the horsemeat was introduced into so many beef products.

French authorities have pointed to an elaborate supply chain that involved Romanian butchers and Dutch and Cypriot traders that resulted in horsemeat disguised as beef being sold in meals like lasagna and moussaka to consumers around the continent.

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