RAPID CITY, S.D. — Federal officials in South Dakota said Monday that 15 people have been indicted for illegally trafficking eagles and other migratory birds after a two-year undercover operation potentially involving hundreds of birds.

U.S. Attorney Randy Seiler said that officials expect “significant” additional federal charges in the case, which focused on trafficking of eagles and eagle parts such as feathers for profit.

Authorities said the case involves more than 100 eagles, a number that could climb as high as 250.

Seiler described one operation as basically a “chop-shop for eagles” in which eagle feathers were stuffed into garbage bags. He said it was clear that it was a moneymaking