(CNN) -- One person was killed in a shooting involving Border Patrol agents at the U.S.-Mexico border, Mexican state media reported Thursday. A U.S. Border Patrol agent shot and killed an adolescent who had been throwing rocks alongside several others at the border, the state-run Notimex news agency said, citing anonymous sources. In a statement released earlier Thursday, the U.S. Border Patrol confirmed the Wednesday night shooting, but did not say whether anyone had been killed. Citing preliminary reports, the Border Patrol said agents saw smugglers drop drugs on the U.S. side of the border in Nogales, Arizona, then return to Mexico.
@highlight
NEW: Mexico: The violence sparks "serious doubts about the use of lethal force"
@highlight
Notimex: A U.S. Border Patrol agent shoots and kills an adolescent
@highlight
Border patrol: An agent opened fire in response to rock-throwing
@highlight
The FBI is investigating
An appeal is pending in a lawsuit filed by the teen's parents in @placeholder federal court, accusing the officer of using excessive force.