The massive re-deployment of police after the July 2005 London bombings is a test of whether more police reduce crime.
There was a 34% increase in hours worked by police in central-inner London in the six weeks that followed the attacks.
Draca, Machin and Witt in Panic on the Streets of London found a 11% fall in crime. A 10% increase in police leads to a 3% fall in crime. This is broadly consistent with previous casual estimates of the impact of police on crime.
Klick and Tabarrok (2005) found that increases in the Terror Alert levels in the Mall area of Washington, D.C cut crime. A 10% increase in police leads to a 3% fall in crime.
Utopia, you are standing in it! 
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