TEENAGE gunman Jeff Weise drove a stolen police car to his school and then randomly shot at students and teachers, authorities said as the town of Red Lake grieved for the victims of the latest rampage to stun the US.

Authorities were today trying to determine what caused a teenager to gun down his grandfather, put on the man’s police-issue belt and bullet-proof vest, and drive his marked squad car to a high school, where he began shooting his classmates at will.

A neo-Nazi teenager who called himself the Angel of Death killed his grandfather and then stole his weapons and police car before embarking on a bloody shooting spree at a United States school, it emerged tonight.