( CNN ) -- The police chief of the violent Mexican border town of Nuevo Laredo has been missing for days , and state authorities are trying to find him , the Tamaulipas Attorney General 's Office told CNN early Tuesday . Travel warning : Violence spreading in Mexico . Roberto Alejandro Balmori Garza was last seen over the weekend , spokesman Ruben Dario Rios said . Local media report that Balmori Garza 's two brothers were found shot dead in the neighboring state of Nuevo Leon on Sunday . Local reports said one of his brothers was a federal prosecutor . The Attorney General 's Office would not confirm those reports to CNN . Widespread drug cartel-related violence has scared local officials into revealing little information about ongoing investigations . Outgoing Mexican president defends legacy in wake of drug war . The state Attorney General 's Office `` has instructed a delegation in Nuevo Laredo to correspond to the respective authorities to establish the collection of information leading to determining the city official 's whereabouts , '' a news release said . In 2005 , the police chief in Nuevo Laredo was gunned down on his first day on the job . In 2010 , gunmen also killed a retired army general put in charge of police there . Read more : Mexico 's invisible women . Nuevo Laredo has been the scene of violent attacks in Mexico 's drug war . Like most Mexican border cities , it offers rows of bars , inexpensive dentists , restaurants and cultural events to draw tourists . But tourism has sharply declined in the past six years as drug cartel violence has spiraled in Mexico . Because of the various bridges into the United States and access to a major highway , rival drug cartels are vying for control of Nuevo Laredo . Gunmen rape 6 tourists near Acapulco , Mexico . Los Zetas , arguably the most violent Mexican drug cartel , are headquartered in Nuevo Laredo , which sits directly across the border from Laredo , Texas . The group has operations in at least 11 Mexican states and has been in a bloody turf war in northeast Mexico with the rival Gulf Cartel for the last several years . In late 2011 , the Texas Department of Public Safety warned against holiday travel to Nuevo Laredo , citing information that the Zetas may be targeting U.S. citizens .
Roberto Alejandro Balmori Garza was last seen over the weekend , he disappeared . Reports say his 2 sons were found shot dead in neighboring Nuevo Leon state Sunday . Nuevo Leon has been the scene of violent attacks in Mexico 's drug wars .