Tensions continue to rise over the death of a Mexican boy earlier this week.
U.S. officials were forced to retreat from the investigation Wednesday, as Mexican security forces pointed their guns towards them.
The dispute is over the death of 15-year-old Sergio Huereka, who was shot by a U.S. border patrol agent.
His body was found 20 feet inside the Mexican border.
An autopsy reveals the fatal shot was fired at close range, meaning the agent may have killed the boy on Mexican soil.
U.S. officials say they have video showing the border patrol agent did not cross into Mexico, but shows Mexican officials coming into U.S. territory.
The video has not been released.