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      Witnesses: Pools of blood left at nightclub shooting scene

      Crime scene

      Club goers scattered when they saw several people shot outside a nightclub Wednesday night.Hidalgo Sheriff TMs Department responded to a call around 11 p.m. at La Puerta Negra in rural Mercedes.Witnesses claim three people were shot after two men were involved in an argument.A third man pulled up in a black Expedition right before the shots were fired, according to witnesses.Witnesses said they saw three ambulances transport three injured men.Nearby residents said this is not the first time shots have been fired at this club.They told Action 4 that last Saturday another argument got out of hand and shots were fired.It TMs still unclear exactly how many people were injured and if a suspect has been caught.Hidalgo County Sheriff TMs Department and crime scene investigators were at the scene examining pools of blood that were left behind.The extent of the injuries has not been confirmed, but Action 4 News will continue to update as information becomes available.