Serial killers all over the world.
A serial killer is traditionally defined as a person who has murdered three or more people over a period of more than a month, with down time (a "cooling off period") between the murders. The motivation for killing is usually based on psychological gratification. Some sources, such as the FBI, disregard the "three or more" criteria and define the term as "a series of two or more murders, committed as separate events, usually, but not always, by one offender acting alone" or, including the vital characteristics, a minimum of two murders.[4][5] Most of the killings involve sexual contact with the victim,[6] but the FBI states that motives for serial murder include "anger, thrill, financial gain, and attention seeking".The murders may have been attempted or completed in a similar fashion and the victims may have had something in common; for example, occupation, race, appearance, sex, or age group.

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