As Steve mentioned be sure to look at the types of crimes. Often areas near schools will have a high number of crimes because parents want the police to strictly enforce traffic laws.
What would be most beneficial though is to encourage your son to take action. He should contact his neighbors and let them know he was robbed and encourage them to report any suspicious activity. If out of area thieves have targeted the area, vigilance will persuade them to go elsewhere. If it is a local resident, enough people watching will get him caught.
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