NEW ORLEANS (AP) — Federal investigators say someone poisoned and killed two bald eagles in Thibodaux.

The U.S. Fish and Wildlife Service and the Louisiana Department of Wildlife and Fisheries are offering $3,500 for information leading to the conviction of whoever killed the national birds.

The partly decomposed eagles were found April 11 about 50 yards apart in a field after someone called the state wildlife hotlline, Fish and Wildlife Service spokesman Tom MacKenzie said.

“We think they may have been killed in late March or early April,” he said.

Lab tests found both had eaten a large amount of poison. Investigators aren’t releasing the kind of poison used and don’t know if the eagles were the target, MacKenzie said.

Bald eagles are protected by the Bald and Golden Eagle Protection Act and the Migratory Bird Treaty Act. Violations carry up to $100,000 in fines and a year in prison.

Anyone with information about the case is asked to call federal wildlife agents at 337-291-3036 or state agents at 800-442-2511.