MEXICO CITY—A prosecutor in Mexico said Tuesday the killing of two Canadians at a Caribbean coast resort last week was motivated by debts between international gangs apparently dedicated to drug and weapons trafficking. On Friday, prosecutors said both dead men had criminal records in Canada, and one was a known felon with a long record related to robbery, drug and weapons offenses. A third Canadian, a woman, was wounded and is being treated at a local hospital, but is not yet able to speak with investigators. “The investigations indicate that this attack was motivated by debts that arose from transnational illegal activities that the victims participated in,” said Oscar Montes, the chief prosecutor of the Quintana Roo state. “The information (is) that they were involved in weapons and drug trafficking, among other crimes.” Montes said the attack had been planned for almost a month by a cartel or gang that …