MINNEAPOLIS (AP) - State and federal authorities have confirmed four more outbreaks of a deadly form of bird flu at Minnesota turkey farms, raising the state's total to 13 farms.

 
The U.S. Department of Agriculture says the new cases are in Cottonwood, Lyon and Watonwan counties, and they've also confirmed a fourth case in Stearns County.
 
The four newly confirmed farms had a combined total of 189,000 turkeys. The remaining turkeys on them will be killed to prevent the spread of the disease.
 
That means producers at the 13 affected Minnesota farms will have lost 872,000 turkeys between birds that died from the disease or had to be euthanized.
 
Officials continue to stress the risk to public health is low, and there's no danger to the food supply.