The attorney general of Quintana Roo state said that several of the dead appear to have been part of the security detail at the 10-day BPM electronic music festival. Pech said a lone gunman apparently entered the nightclub and began to exchange fire with another person inside. Festival security personnel tried to stop the shooting and came under fire. He said three people had been detained nearby, but it was unclear if they had been involved in the shooting. 6:32 a.m.: Updated with official statement from Quintana Roo policeThis story was originally posted at 5:25 a.m.

Source: Los Angeles Times January 16, 2017 14:34 UTC