Oregon school shooter identified as 16-year-old who used his mother’s shotgun

The Oregon teen who gunned down three elementary school students and a teacher in a crazed rampage before he was shot dead by a courageous bystander has been identified.

Follow for live updates on the mass shooting at Silver Rail Elementary in Bend, Oregon

John J. Griffin was armed with his mom’s pump-action shotgun when he opened fire inside Silver Rail Elementary School in Bend on Thursday – killing three kids, the youngest being a 5-year-old, and a teacher, sources told The Post and three senior law enforcement officials told NBC News.

The shooter, 16, critically injured another student and teacher before being shot dead by a heroic bystander believed to be a student’s dad. 

Cops swooped on the school just after 1 p.m. and the gunman was already dead by the time they had arrived.

Authorities are continuing to probe the shooter’s motive for opening fire at the school, which is attended by 450 students.

The shooting was Oregon’s eighth fatal mass shooting since 1998. 

This is a breaking news story and will be updated.