Law enforcement officials are investigating “a manifesto from this individual” that suggests the incident may be a hate crime, the police chief, Greg Allen, said. He added that law enforcement still needed to “validate for certain” that the document under investigation was from the arrested suspect.

Investigators are “reasonably confident” that the Walmart shooting suspect posted the document on 8chan, an extremist online message board that often features racist content, senior law enforcement officials told NBC News.

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