The San Antonio detective and officers shot in Missouri and Florida were conducting routine tasks Sunday when they became the targets of violence.
The detective was writing a traffic ticket when he was shot to death in his squad car Sunday morning outside police headquarters.
"I think the uniform was the target and the first person that happened along was the first person that (the suspect) targeted," San Antonio Police Chief William McManus said yesterday.
The shootings were the latest in what law enforcement officials say is an alarming spike in ambush-style attacks.
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Sixty officers, including the San Antonio detective, were shot to death on the job this year, compared to 41 in all of 2015, according to the National Law Enforcement Officers Memorial Fund.
Of the 60 killed, 20 were purposely targeted by their assailant compared to eight last year, the group said.
All the shootings come less than five months after a black military veteran killed five white officers at a protest in Dallas the deadliest day for American law enforcement since September 11, 2001.
Race was a factor in the Dallas attack, but police have not said if race played a part in any of the attacks on Sunday.
In San Antonio, police say the suspect is black and the officer was white. In St. Louis, the suspect was black, but police have not released the officer's race.