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Professional killers hired by Mexican drug cartels kidnap, murder and torture rivals, with some hitmen as young as 12 years old.

In this Al Jazeera special, Mariana Sanchez interviews one of the contract hitmen who says he has even killed friends and family members for "disrespecting his boss".

Al Jazeera warns that some viewers may find the content in the interview disturbing.

Source: Al Jazeera