SAN DIEGO — An American citizen was killed in a shootout with U.S. Customs and Border Protection officers Monday night at the San Ysidro Port of Entry.

Police received a call of an officer-involved shooting about 7:45 p.m. Monday and responded to the secondary inspection area of the Port of Entry to assist CBP agents. There, they learned a 23-year-old suspect had been wounded in the shooting, according to Lieutenant Matt Dobbs of the San Diego Police Department.

“CBP officers and San Diego Fire-Rescue personnel attempted life-saving measures on the suspect; however, he unfortunately did not survive his injuries,” Dobbs said.

Witnesses told investigators the suspect was driving through the Port of Entry from Mexico into the United States when he refused to stop for CBP officers and “attempted to drive through the inspection area,” Dobbs said. CBP officers tried to stop the suspect, whose vehicle was eventually blocked by another vehicle.

“The suspect began firing a gun out of his vehicle towards the officers, then exited his vehicle and continued firing at the officers,” Dobbs said. “The officers returned fire, striking the suspect.”

The name of the suspect was not immediately released, but he was a U.S. citizen, Dobbs confirmed.

Seven CBP officers were involved in the shooting, but none were injured.

Anyone who witnessed the shooting was asked to call SDPD’s Homicide Unit at 619-531-2293 or Crime Stoppers at 888-580-8477.