Helicopters and lifeboats from Harwich and Walton-on-the-Naze were involved in the search for the missing people.

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"What we have today is that there are no signs that the horsemeat was in Polish beef, " Naze said.

NPR: Poland: Still No Sign Country Source Of Horsemeat

The issue has barely been an issue in the Polish media, and Naze, the official in charge of the investigation, has repeatedly cast doubt on the accusations.

NPR: Poland: Still No Sign Country Source Of Horsemeat

To date, Poland has carried out DNA testing at a national laboratory in Pulawy, in southeastern Poland, on 14 meat samples taken from a cold storage unit, Naze said.

NPR: Poland: Still No Sign Country Source Of Horsemeat

Jaroslaw Naze, deputy head of Poland's General Veterinary Inspectorate, said Ireland needed to hand over more documentary evidence, including of labels on the suspected meat supplies, so that Polish officials can complete their own investigation.

NPR: Poland: Still No Sign Country Source Of Horsemeat