In the Columbine High attack in 1999, two teenagers killed 12 fellow students and a teacher before killing themselves.

Park animals suffered an attack in May 2003, when three teenagers, all 18, killed three ducks, three emus and two rheas.

The teenager killed in crash with stolen car.

She said, "Eight teenagers in Boston raped and killed a woman.

Prosecutors said the teenagers had killed the deliverymen simply for the experience.

One idea: teenagers killed the monks at the behest of one of their fathers.

In the most extreme cases, including the shootings at Columbine High School, teenagers actually killed together.

Screenwriter Bill Condon has a brief cameo as a teenager killed at the film's opening.

According to the indictment, the teenagers first conceived of the plan to rob and kill people in June 2000.

All of these drug addict parents are the real reason teenagers are killing each other.