The officers sitting in front of a bank of TV screens
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Hearing and speech-impaired officers monitor CCTV in Mexico

21 November 2013 Last updated at 07:54 GMT

A new team of police officers is proving particularly adept at spotting crime on the streets of the Mexican city of Oaxaca.

The special surveillance unit, called Angels of Silence, is comprised of officers who can not hear or speak.

Bruno Garcez reports.