Federal prosecutors said Friday there was insufficient evidence to pursue charges against a U.S. Border Patrol agent in the shooting death of a 15-year-old Mexican national in 2010.

The agent didn’t act inconsistently with Border Patrol policy or training regarding the use of force in the death of Sergio Hernandez-Guereca, the U.S. Department of Justice said in a statement announcing the decision, which was quickly denounced by the Mexican government.

U.S. authorities have said the agent shot Hernandez while trying to arrest illegal immigrants crossing the Rio Grande on June 7, 2010. Some witnesses said people on the Mexican side of the river, including Hernandez, were throwing rocks at the agent. Border agents are generally allowed to use lethal force against rock throwers.

The shooting occurred under one of the border bridges in El Paso, and it was recorded by an eyewitness with a cellphone.

The Mexican government issued a statement saying it “profoundly regrets and expresses its strong opposition to the decision” and was considering its next step. Mexican ambassador to the U.S. Arturo Sarukhan had a similar reaction to the decision, tweeting: “Mexico strongly rejects it.”

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