At least 1,17,000 chickens were destroyed in northern Bangladesh today after avian flu outbreak on one of the country's largest poultry farms. A local official said the deadly H5N1 strain of flu was detected yesterday when 400 chickens died suddenly at the Kazi Farms complex in Thakurgaon town. He said tests confirmed presence of the H5N1 bird flu in 15 sheds of the farm and the authorities ordered destruction of all 1,17,600 layer chickens. Kazi Farms is Bangladesh's largest poultry bird and egg producer. Bangladesh was hit by bird flu in February 2007, when more than one million birds were slaughtered on thousands of farms across the country.