Unidentified gunmen opened fire in a bar in the central Mexican city of Irapuato on Saturday evening, shooting dead six women and five men, local authorities said, the second mass shooting in the state of Guanajuato in less than a month. The city government said in a statement security forces were trying to track down the assailants behind the attack that took place in the Lupita neighborhood on Irapuato’s southern rim. Guanajuato, a major manufacturing hub and production site for many of the world’s top carmakers, has been convulsed in recent years by brutal turf wars between rival drug gangs.