Indiana officials are investigating reports of drone activity at farms affected by bird flu outbreaks. In some cases, people have tried to shoot the drones, and the aircraft may be spreading the bird flu virus.

Indiana’s State Board of Animal Health is reporting that another flock of birds has been hit with bird flu, resulting in the mass termination of the animals.

Indiana-based Rose Acre Farms, the second largest egg producer in the U.S., has confirmed fowl deaths from bird flu at its Indiana facility.