mobile reporter ray gomez visits crime scenes. and these days, that's a full-time job. ray: cancun used to be a quiet town. people didn't lock their doors at night. now there are up to six murders a day. the drug cartels are fighting each other, grandstanding, proving they're the tougughes. and they're destroying a tourist idyll. reporter: we spend a day with ray. it's action-packed. murders are usually preceded by threats. at this nightclub, owner emilio has to pay protection money. he's scared, but he's willing to tell us how the system works. emilio: they come and shoot at your business, they tell you they'll send someone you need to pay if you don't want it to happen again. you can't refuse. you pay up or they shoot. reporter: the nightclub has bulletproof doors and armed bouncers. it's frequented by tourists. but the owner gets no help from the police. emilio: we built up cancun and put it on the tourist map. local businesses played a big part in that. the government did nothing. reporter: the first shots are fired at 7:00 in the evening. ray begins his live e repor