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A fight among rival drug organizations for control of trafficking routes through Nuevo Laredo has turned it into one of the most violent cities along Mexico 's border with the United States , and the shootings appeared to be the latest round in that fight , the authorities said .
 location contains: Mexico, Nuevo Laredo
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Mexico, Nuevo Laredo 
Answer:
 location contains: Mexico, Nuevo Laredo