The U.S. Border Patrol has killed at least 15 people killed in the Southwest since January 2010. The New York Times calls the deaths “a jolt to the careful balance of sovereignty and security that underlies a binational debate over immigration reform.” The shootings, some during confrontations that began with assaults on agents, have increased criticism of agents and customs officers who operate along the U.S.-Mexico border. Lawmakers, civil rights advocates and victims' families in both countries, concerned about what they view as a lack of oversight and accountability, have made angry demands for answers. Of the 15 victims, 10 were Mexican citizens, 6 of whom died in Mexico, felled by bullets fired by agents in the United States. Since January 2010, not a single agent has been criminally charged in cases of lethal use of force. The agency would not say whether disciplinary action had been taken.