A police officer was apparently assassinated during a traffic stop on Sunday, San Antonio police said.

San Antonio Police Chief William P. McManus said Sunday that the officer was sitting inside his car just outside police headquarters when he was shot and killed.

The officer —  beyond the fact that he was a 20-year veteran — has not been identified in the shooting that happened around 11:40 a.m. on Sunday, reports CBS San Antonio affiliate KENS.

McManus said the officer had pulled someone over and was writing them a ticket when a black car pulled up behind the officer and stopped.

The driver then got out, approached the officer, shot the officer once through the window, and then reached into the officer’s car and shot the officer again.

After the shooting, McManus said the driver then got back in his car, and escaped in part by driving through the police headquarters’ parking lot.

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Image courtesy of KENS-TV