The “Guardians of the Galaxy” star announced an additional reward on his Twitter account on Monday.
“If there is still no reward for the arrest and conviction of the miserable MAGATs who did this, I will bet $ 20,000. And I promise there will be a bonus for that reward!” he said.
The manatee was discovered on January 10 in Florida’s Homosassa River, with the president’s name scraped on its back, according to a press release from the Center for Biological Diversity.
It is not clear what was used to mark the animal.
The Center has already announced a $ 5,000 reward for information leading to conviction, according to a press release.
Officials from the US Fish and Wildlife Service and the Florida Fish and Wildlife Conservation Commission are investigating. Anyone with information can call the commission hotline at (888) 404-3922.