Secretary of State at Defra, Owen Paterson, MP for North Shropshire, says sale of horse meat as beef was totally unacceptable.
He told the NFU conference in Birmingham.
"I am determined this criminal activity should be stopped."
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The 46-year-old was arrested on suspicion of membership of a proscribed organisation and malicious communications.
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The serving Mayor of Wolverhampton, Cllr Elias Mattu, has died at the age of 59 after a battling with a lengthy illness.