Police investigators work on the crime scene where a shooting erupted after an attack against the building of the Quintana Roo State Prosecution, in Cancun, Mexico, on January 17, 2017.  The shooting happened as Mexican authorities investigate whether a feud over local drug sales was behind a nightclub shooting that killed three foreigners and two Mexicans Monday at the Blue Parrot club during the BPM electronic music festival in Playa del Carmen, a usually peaceful Caribbean seaside town. / AFP / STR        (Photo credit should read STR/AFP/Getty Images)
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