Three U.S. Marines were injured in a shooting south of Mexico City on Friday morning, a Mexican military official told CNN Mexico. The motive behind the attack on the American servicemen, who were on a diplomatic mission, was not immediately known.
Unknown gunmen inside what was described as a Mexican federal police vehicle fired upon a U.S. Embassy vehicle that carried the U.S. servicemen, said the official, who declined to be named for security reasons.
The injured Marines were transported to a hospital in Cuernavaca, Mexico.
The Marines were dressed in civilian clothes, the Mexican official said.
The Drug Enforcement Administration confirmed that a U.S. diplomatic vehicle was "shot up" in Mexico, but said no DEA officers were involved in the incident.
The U.S. State Department said it was aware of the reports, but had no immediate comment.
The U.S. vehicle was attacked on the highway between Mexico City and Cuernavaca, near the town of Tres Marias.
Mexico's federal police said that its personnel were not involved in the shooting. Their forces appeared at the scene only after the shooting to secure the perimeter, police said.