WARSAW, Poland (AP) — Investigations in Poland have found no evidence backing Irish claims that Poland was the source of horsemeat that ended up in Irish and British burgers, a top Polish veterinarian said on Thursday.

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 meet supplies, so that Polish officials can complete their own investigation.