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Two gunmen shot dead seven people, most of them members of the taxi drivers union, at a bar in Cancun.
Most of the victims were members of the taxi drivers union, the AP said.
Police said they were investigating links between the union and organized crime after the attackers who entered "The Little Mermaid" bar specifically targeted union members meeting there on Thursday, El Universal reported.
Reuters said the men were armed with a machine gun and a handgun.
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