INDIANAPOLIS — A store clerk’s curiosity about why Najibullah Zazi was buying large quantities of beauty supply products is an example of the kind of vigilance that can combat terrorism, a police commander said Saturday.

Los Angeles Police Cmdr. Joan McNamara cited this summer’s incident as police chiefs meeting in Denver adopted a model for a nationwide community watch program that teaches people what behavior is truly suspicious and encourages them to report it to police.

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