Preliminary tests showed no signs of bird flu in three dead swans found on a Baltic beach in the northern city of Krynica Morska, local authorities said on Wednesday according to Reuters. "After tests we can say that this was not bird flu," Anna Dyksinska, spokeswoman for the local government in Gdansk, told Reuters. Earlier on Wednesday Germany said it detected the H5N1 virus in dead swans found on the Baltic island of Ruegen. Birds in Italy and Greece have also been affected. Separately, police said three more swans were found dead by a river in the southern Polish town of Rybnik. "We have notified a local vet inspector," police spokesman Arkadiusz Szweda said. The deadly H5N1 strain of bird flu has killed 91 people in Asia and the Middle East and forced millions of poultry to be culled. Poland's chief vet Krzysztof Jazdzewski earlier told Reuters Poland might soon order poultry to be kept indoors again.