Sources : FBI : The violence sparks ` ` serious doubts about the use of lethal force '' Notimex : `` As a matter of international responsibility , the fact that the victim was on Mexican soil when he was killed does not absolve the United States of responsibility for the acts of its agent , '' the brief said . A U.S. Border Patrol agent shoots and kills an adolescent . Border patrol : An agent opens fire in response to rock - throwing . The FBI is investigating .
Sources : FBI : The violence sparks ` ` serious doubts about the use of lethal force '' Notimex : A U.S. Border Patrol agent shoots and kills an adolescent . Border patrol : An agent opens fire in response to rock - throwing . The FBI is investigating .