Here is a timeline of events which led to the announcement that horse DNA had been found in Irish-produced beef burgers. It is based on statements made by Tánaiste Eamon Gilmore and Minister for Agriculture Simon Coveney.
Mid-November: In routine tests, the Food Safety Authority of Ireland (FSAI) samples 27 beef burger products from major retail outlets and tests for animal species using DNA sampling. A resample of burgers is taken and test results sent to Germany to check accuracy.
Friday, December 21st: FSAI asks Department of Agriculture for help to take extra samples from ingredients being added into burgers at processing plants. Results sent for testing in Germany.
Friday, January 11th: FSAI receives test results from Germany on ingredients and burgers
Monday, January 14th: FSAI shares results with Department of Agriculture. Minister for Agriculture Simon Coveney is informed of the problem. Department of Agriculture begins a full investigation.
Tuesday, January 15th: Mr Coveney tells the Cabinet of the problem. FSAI informs supermarkets, which begin to withdraw products. FSAI makes details of investigations public.
Wednesday, January 16th: UK Food Standards Agency begins investigation after it becomes known some affected products were sold in British supermarkets.