The FSA has ordered UK firms to test all processed beef foods to verify the ingredients.

BBC: Polish firm says it 'does not process horse meat'

The FSA in the UK has ordered food businesses to carry out tests on all processed beef products and the first results are expected on Friday.

BBC: Horsemeat scandal: PM says criminals will face law

The results of FSAI tests, released to the UK FSA on 14 January, revealed some burgers made at the Silvercrest plant contained up to 29% horsemeat, constituting a "gross contamination".

BBC: UK