The Latest on the fatal shooting of a San Antonio police officer (all times local):

4:30 p.m.

Authorities say the San Antonio police officer who was fatally shot while writing a ticket in his squad car was Det. Benjamin Marconi.

Chief William McManus says an unknown suspect shot 50-year-old Marconi twice in the head. Marconi was a 20-year veteran of the force.

McManus says the suspect is considered to be "extremely dangerous and a clear threat" to both officers and the public. He says officers have been advised to not make traffic stops alone.

McManus said the officer had pulled over a vehicle and while he was inside his squad car writing a ticket, a vehicle pulled up behind him. He says the driver of that vehicle then walked up to the officer's driver-side window and opened fire.

He says he does not believe the original motorist pulled over had any relationship to the shooter.

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3 p.m.

Texas Gov. Greg Abbott is calling the fatal shooting of a San Antonio police officer a "horrific act of violence."

In a statement Sunday, Abbott asked Texans to pray for the officer's loved ones. He says "attacks against law enforcement officers will not be tolerated in Texas and must be met with swift justice."

Police say that the officer was fatally shot while writing a traffic ticket outside of police headquarters. Police Chief William McManus said the suspect is not known and has not yet been apprehended. A motive is not known.

McManus said the officer had pulled over a vehicle and while he was inside his squad car writing a ticket, a vehicle pulled up behind him. He says the driver of that vehicle then walked up to the officer's driver-side window and opened fire.

The officer, a 20-year veteran of the force, was pronounced dead at a hospital.

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2:15 p.m.

The mayor of San Antonio is extending her condolences to the family of the police officer who was fatally shot and the entire police force.

In a statement Sunday following the shooting, Mayor Ivy Taylor said, "This type of crime cannot and will not be tolerated."

Police say that the officer was fatally shot while writing a traffic ticket outside of police headquarters. Police Chief William McManus said the suspect is not known and has not yet been apprehended. A motive is not known.

McManus said the officer had pulled over a vehicle and while he was inside his squad car writing a ticket, a vehicle pulled up behind him. He says the driver of that vehicle then walked up to the officer's driver-side window and opened fire.

The officer, a 20-year veteran of the force, was pronounced dead at a hospital.

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1:45 p.m.

Authorities say a San Antonio police officer has been fatally shot while writing a traffic ticket outside of police headquarters.

San Antonio police Chief William McManus said the officer was killed late Sunday morning. He says the suspect has not yet been apprehended and a motive is not known.

McManus says the officer had pulled over a vehicle and while he was inside his vehicle writing a ticket, a vehicle pulled up behind him. He says the driver of that vehicle got out, walked up to the officer's driver-side window and shot the officer in the head.

The officer was pronounced dead at a hospital. He was a 20-year veteran of the police force.

McManus says, "This is everyone's worst nightmare."