Mexico 's foreign ministry has accused a U.S. Border Patrol agent of fatally shooting a Mexican citizen along the border . Border Patrol says rocks were thrown at its agents . Mexico 's foreign minister says ` ` disproportionate use of lethal force '' The FBI is investigating .
Border Patrol says rocks were thrown at its agents . Mexico 's foreign minister says ` ` disproportionate use of lethal force '' The FBI is investigating .