ANIMATION posted on the web by Jeff Weise, the Minnesota high school boy who killed nine people before committing suicide, shows a gunman killing people and then himself. It has also emerged that the 16-year old was being treated with the controversial anti-depressant Prozac.

TheSmokingGun. com reported Weise posted a computer animation on a website in October that shows four people being shot. The 30-second animation, entitled Target Practice, depicts a person shooting two people in the head, a third in the chest, blowing up a squad car and then shooting a Ku Klux Klan member. The shooter then puts a gun in his mouth and fires.

The revelation by Weise's aunts that the boy was on Prozac has revived the debate over whether such drugs induce homicidal thoughts in children. Eric Harris, one of the gunmen in the Columbine massacre in 1999, had been prescribed Prozac, as had Kip Kinkel, who killed his parents and classmates at Thurston High School in Oregon in 1998.

Weise killed his grandfather and the man's girlfriend before murdering five students, a teacher and a security guard at Red Lake High School last Monday.