The British government says an outbreak of bird flu in eastern England is the deadly H5N1 strain of the disease.
The return of the disease is yet another blow to farmers, who are already struggling after herds were hit this year by foot-and-mouth disease and bluetongue. The first mass outbreak of bird flu was confirmed in Britain earlier this year.
Officials say the source of the outbreak has not yet been identified, but it is closely related to the strains found in the Czech Republic and Germany over the summer.
Officials had said previously that about 5,000 free-range turkeys, 1,000 ducks and 500 geese on the affected farm were being culled.
A two-mile protection zone and a six-mile surveillance zone have also been created around the infected farm.