Brazil ? A 16-year-old boy has admitted to the murders of 12 people in southern Brazil, according to a police investigator who described a chillingly calm confession.

The teenager, whose identity was not revealed because he is a minor, allegedly told police he killed his victims over the past three months in a fit or rage or out of revenge, and police inspector Enizaldo Jose Plentz said Friday he believes the boy killed some of his victims for enjoyment.

He said police have enough evidence to prove that the teenager, an unemployed high school dropout, shot dead at least six of the 12 people he says he killed.

Police were still trying to determine if another six people killed in and around Novo Hamburgo were in effect the teenagers’ victims.