Gunmen attack U.S. diplomatic vehicle in Mexico

(CNN) — Unknown gunmen attacked an American diplomatic vehicle south of Mexico City, injuring three people, a Mexican military official told CNN Mexico.

The motive behind the attack on the U.S. vehicle, which was on a diplomatic mission, was not immediately known.

Gunmen inside what was described as a Mexican federal police vehicle fired upon a U.S. Embassy vehicle, said the official, who declined to be named for security reasons.