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A Minnesota man who allegedly pledged allegiance to ISIS and told an FBI source he planned to open fire on a crowded Mall of America event was arrested after purchasing an AK-47-style rifle, four magazines and 200 rounds of ammunition from an undercover employee, according to a federal criminal complaint unsealed Wednesday. 

The Mall of America in Bloomington, Minnesota. (Michael Siluk/UCG/Universal Images Group via Getty Images, File)

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