Thirteen bald eagles were found dead at a Maryland-area farm over the weekend and federal authorities are currently investigating, and offering a reward for any information.

The Maryland Natural Resources Police (NRP) were first called to the scene on Saturday afternoon after a man discovered four dead bald eagles on a farm in Maryland’s Eastern Shore region, according to NRP spokeswoman Candy Thomson.

“Our officers searched the area around the farm and in total we found 13 bald eagles, three were mature, two were in the process of maturing and the rest were immature.” Thomson said.

Bald eagles are considered fully…

Read the rest of the story from our partners at NBC News

Get The Brief. Sign up to receive the top stories you need to know right now. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Contact us at letters@time.com.