BUFFALO (AP) -- A Mankato man faces charges after a package containing the illegal substance khat showed up at a central Minnesota post office.

Wright County deputies were called Saturday to the Buffalo Post Office on a report of a suspicious package. It turned out to contain khat, a dried plant commonly used in East Africa and parts of the Arabian peninsula that can give users a high when chewed.

The khat weighed more than 10 pounds and had an estimated street value of about $4,000.

An investigation led to the arrest of a 50-year-old man. He faces possible charges of possession of a controlled substance.

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