A U.S. military helicopter crashed Friday afternoon near the southern border, killing two soldiers and a U.S. Border Patrol agent, according to a statement from the military. Another soldier was injured in the incident. The UH-72 Lakota helicopter assigned to the federal Southwest border support mission was conducting aviation operations near Rio Grande City, Texas, a military statement said. The cause of the crash is under investigation. The helicopter was following migrants before it crashed in “an open field.”