( CNN ) -- The Mexican government condemned the U.S. Border Patrol 's use of lethal force that resulted in the death of an apparently undocumented migrant on the California-Mexico border this week . The migrant was identified by Mexican authorities as Mexican national Jesus Flores Cruz . `` We also firmly reiterate that the use of lethal force in border control operations is unacceptable . The Government of Mexico expects the results of the investigations and that those responsible be held accountable , '' the Secretariat of Foreign Relations said in a statement Thursday . The Mexican government is seeking a thorough investigation of the incident . Since January 2010 , at least 28 individuals have died as the result of an encounter with U.S. Customs and Border Protection officials , said the activist group Southern Border Communities Coalition . At least 27 deaths resulted from the use of lethal force , and one person died after not receiving adequate medical attention , the group said . On Tuesday , a Border Patrol agent shot and killed an apparently undocumented migrant who allegedly threw rocks at the agent , striking his face , on the border near San Diego , authorities said . A social justice advocacy group criticized the Border Patrol 's use of deadly force in the incident , saying there 's a disturbing trend of Border Patrol `` killings of rock throwers , some of whom were teenagers and some whom were U.S. citizens '' on the U.S.-Mexico border , said Andrea Guerrero , executive director of Alliance San Diego . The Border Patrol declined to comment directly on this week 's incident , which is under investigation by local authorities , but in the past , the agency has highlighted how agents are seriously injured in rock-throwing incidents and resort to lethal force to protect themselves . Guerrero said , however , some police experts advise using nonlethal force such as pepper-ball guns to respond to rock throwings . `` Border agents should adhere to best policing practices and only use lethal force as a last resort , not the only resort , '' Guerrero said . Rock-throwing incidents have been controversial on the U.S.-Mexico border , particularly when Mexicans have thrown projectiles from the Mexico side of the international line toward Border Patrol agents on the U.S. side . In some cases , U.S. Border Patrol agents have fired their guns at the rock throwers on the Mexico side of the border , killing the rock thrower . Mexican officials have condemned the Border Patrol 's use of lethal force as excessive . The U.S. Border Patrol said the incident occurred in a rugged section of the Otay Mountains near San Diego where the agent was trying to arrest several immigrants who crossed the border illegally . Two other undocumented migrants were arrested and in custody , the agency said . The San Diego County Sheriff 's Department , which is investigating the killing , said in its account that two Border Patrol agents were trying to detain a group of suspected undocumented migrants in rugged terrain in the mountain 's White Cross area about four miles east of the Otay Mesa border crossing . The border patrol agent who fired his service weapon suffered minor injuries , the sheriff 's homicide unit said . CNN 's Jaqueline Hurtado contributed to this report .
Mexico calls U.S. Border Patrol 's use of lethal force `` unacceptable '' Mexican national Jesus Flores Cruz was shot and killed in Border Patrol confrontation . Score: 6 Border Patrol has said its agent must use lethal force as protection .