Officers took a teen from north suburban Gurnee, Ill. for a psychological evaluation after finding him engaging in a Satanic ritual in a public park.

After having an argument with his mother, the 15-year-old left his house with a knife, telling her he was headed to the garage to cut up some veal for a "devil-worshipping ritual."

His mother tried to stop him, according to a TribLocal story: she grabbed his hoodie to try and restrain him, but he twisted her wrist and pulled away.

He then went to nearby Gowe Park, behind Warren Township High School. When police found him there, he was burning candles and had drawn a pentagram in the ground in charcoal, the Chicago Sun-Times reports.

He told officers he was "trying to invoke the beast."

The young man was taken to Vista West Medical Center in Waukegan, Illinois for evaluation, Gurnee Police Commander Jay Patrick told the press.