Oregon elementary school shooter Griffin John may have developed an “obsession with Nazism” before he gunned down three young students and a teacher last week, according to a report.

The 16-year-old shooter’s electronics were seized from his mom’s home and investigators have been combing through his online activity to try to piece together his sick motive for the deadly rampage at Silver Rail Elementary School, The Oregonian reported.

John’s potential online interactions with violent extremist groups — including the twisted, predatory terror cult “764” – are also being investigated, two law enforcement sources familiar with the investigation told the outlet.

Here’s the latest on the elementary school shooting in Oregon:

The group’s sick members threaten, blackmail and manipulate young people into sharing or live-streaming violence, suicide and sexual explicit acts, prompting warnings from law enforcement officials across the country and a number of arrests.

John opened fire last Thursday outside of the Bend school with a pump-action shotgun purchased by his mother before he entered the school and killed three children between the ages of 5 and 11 and a 25-year-old teacher in a special education classroom.

He also wounded another teacher, 54, and shot a 7-year-old girl in a wheelchair in the face.

The bloodshed finally ended when a brave bystander jumped into action and shot the gunman.