Two police officers have been shot in separate incidents in what authorities are calling targeted attacks. One died while the other was shot twice in the face but was expected to survive.

Authorities say a San Antonio detective writing out a traffic ticket to a motorist was shot to death in his squad car late Sunday morning outside police headquarters by another driver who pulled up from behind.

San Antonio police Chief William McManus identified the officer as 50-year-old Benjamin Marconi, a 20-year veteran of the force.

In St. Louis, a police sergeant was hospitalized in critical condition but expected to survive after being shot twice in the face Sunday night in what the police chief called an "ambush." Police reported early Monday that the suspect was later killed in a shootout with police.