Gunmen burst into a bar in a blue-collar neighbourhood of the Mexican beach resort of Cancun, killing seven people, including the head of a taxi union, the state prosecutor's office said. Four men with weapons arrived in a convoy of cars in front of "The Mermaid" bar before entering the place and shooting at a group of people on Thursday, the Quintana Roo state prosecutor's office said. A number of people were wounded. Six victims died on the spot while another one succumbed to his wounds while being taken to a hospital.