Police continue to investigate a series of incidents where animals were found mutilated on Penn State’s campus after being killed with homemade arrows, according to WJAC. Several of these incidents have been reported since August 10.

“I sent photos of rabbits and squirrels with arrows inside them,” Robyn Graboski, head of Centre Wildlife Care, told WJAC. “A lot of people say it’s just hunting, but this is not hunting. It’s an insult to respectable hunters.”

The Game Commission said the homemade arrows that officers have found in animals on campus are made from X-Acto knives. The individual responsible for killing the animals could be fined more than $4,000 for illegal hunting.

The Game Commission is offering a reward for anyone who can help its wildlife conservation officers find out who is responsible.