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We study the effects of police monitoring on crime. We exploit detailed information on the location and date of installation of police‐monitored surveillance cameras, coupled with data at the street‐segment level on all reported crimes in the city of Montevideo, Uruguay. We find that the introduction of police‐monitored surveillance cameras reduces crime by about 20 percent in monitored areas relative to a pure control group located outside the city. We also explore potential displacement effects, and we do not find evidence of such effects.