I don't know how true this story is, but I really wouldn't doubt it.
http://www.chron.com/disp/story.mpl/topstory/7607122.html
http://www.chron.com/disp/story.mpl/topstory/7607122.html
The elderly are killed. Young women are raped. And able-bodied men are given hammers, machetes and sticks and forced to fight to the death.
In one of the most chilling revelations yet about the violence in Mexico, a drug cartel-connected trafficker claims fellow gangsters have kidnapped highway bus passengers and forced them into gladiatorlike fights to groom fresh assassins.