Tests for the deadly bird flu were being conducted on a group of dead migratory birds found yesterday morning on the podium of a skyscraper in Kowloon Bay. Health officials are taking the precaution after a dead grey heron found in Lok Ma Chau, near the Shenzhen border on Wednesday, was confirmed to have H5N1 flu. The birds found yesterday - 12 blackbirds and one Japanese white-eye - hit the glass wall of the Skyline Tower in Wang Kwong Road. They are being tested for the H5 virus at the laboratory of the Agriculture, Fisheries and Conservation Department (AFCD), a department spokesman said. Blackbirds are winter visitors and usually pass through Hong Kong in their migratory flight path. The Japanese white-eye is a local species, the spokesman said. A security guard saw the birds fall after they hit the wall, a spokeswoman for Sino Estate Management said. A cleaner was called in to dispose of them but one bird was missed, she said. It was spotted by a passer-by who then reported it to the police, she said. The spokeswoman said the cleaner was sent for a medical check-up as a precaution. She said it was the first such incident at the building, which was opened to tenants in December last year. Food and Environmental Hygiene Department staff then collected the carcasses and took them to a refuse collection point before they were handed to the AFCD for tests late yesterday. In January, a dead peregrine falcon found near the Gold Coast residential development in Tuen Mun also tested positive for the virus. Outbreaks of H5N1 have killed 32 people in Thailand and Vietnam this year and prompted poultry culls across Southeast Asia. An outbreak of bird flu in Hong Kong infected 18 people in 1997, killing six.