Bosnia Herzegovina has reported its first cases of bird flu. The disease was found among swans on a lake in the west of the Balkan country. Health officials said samples of the Bosnian outbreak have been sent to a laboratory in Britain for tests.A cull of thousands of chickens and ducks is being carried out. Fears that bird flu is spreading is damaging the poultry meat industry in many European countries. In the UK, there have been calls to restrict free range poultry from feeding outside. “You really want to try and stop the virus getting into chickens in the first place in England and the way you can do that is reducing chickens meeting migrating birds,” said a prominent vet. “The way to do it is stopping chickens feeding outside”. The ravens of the Tower of London have been put in enclosures to protect them from being infected by wild birds. But British authorities are rejecting calls for drastic action, saying the country is not on the path of the migrating wild birds concerned in the outbreak.