Does immigration lead to more crime?

Some research findings:

• The most striking finding from our research is that for murder, robbery, burglary and larceny, as immigration increased, crime decreased, on average, in American metropolitan areas. The only crime that immigration had no impact on was aggravated assault. These associations are strong and stable evidence that immigration does not cause crime to increase in U.S. metropolitan areas, and may even help reduce it.
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• There are a number of ideas among scholars that explain why more immigration leads to less crime. The most common explanation is that immigration reduces levels of crime by revitalizing urban neighborhoods, creating vibrant communities and generating economic growth.
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• We found that cities with historically high immigration levels are especially likely to enjoy reduced crime rates as a result of their immigrant populations.