DES MOINES, Iowa (AP) The confirmation of bird flu at another Iowa egg-laying farm will force the killing of more than 5 million chickens, state officials said Friday.

Its the second confirmed case of avian influenza in Buena Vista County, about 160 miles (257 kilometers) northwest of Des Moines, but the latest outbreak is at an operation with 5.3 million chickens. The earlier case was at a farm with about 50,000 turkeys .

The latest case confirmed by the state Department of Agriculture means nearly 12.6 million chicken and turkeys in at least eight states have been killed or will be destroyed soon.