SEATTLE (AP) — A necropsy has determined that a seal lion died from a gunshot wound, marking the 10th to have been found shot and killed in the Puget Sound.

Killing sea lions is illegal under the federal Marine Mammal Act. It’s punishable by up to a year in prison and a $25,000 fine.

The Marine Animal Rescue and Sea Shepherd Seattle are offering rewards for information about the shootings that leads to an arrest.