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The real-time traffic app Waze has earned the ire of the Los Angeles Police Department, which contends the app jeopardizes the lives of police officers.

In a Dec. 30 letter to Google, which acquired Waze in 2013, LAPD Chief Charlie Beck wrote that by indicating the locations of police, the app compromises the safety and security of officers, according to a copy of the letter obtained by The Times.

Beck noted that in the days before slaying New York Police Department Officers Rafael Ramos and Wenjian Liu on Dec. 20, Ismaiiyl Brinsley used the application to monitor police movements.

“I am confident your company did not intend the Waze app to be a means to allow those who wish to commit crimes to use the unwitting Waze community as their lookouts for the location of police officers,” Beck wrote.

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