Two men, including a United States citizen, were arrested after a shooting in Tijuana that killed one officer.
Authorities say that the weapons used in the attack were brought into Mexico from the U.S.
Two officers responded to reports of shots fire at the corner of de Coahuila and Constitucion in Zona Norte on Saturday morning, and were met with gunfire from a vehicle.
One officer was killed in the shooting and two others suffered bullet wounds to the upper torso. The condition of the two injured officers is unknown.
The two suspects fled the scene but were arrested shortly after and found in possession of two firearms.
Authorities do not know if the U.S. citizen has ties to San Diego.