SIOUX FALLS, S.D. (AP) — Sioux Falls police are investigating an armed robbery of a casino.

The Argus Leader reports police were called to Happy Jacks casino Friday night, after a report of a man threatening an employee with a handgun.

Authorities say the suspect fled on foot from the casino with an unknown amount of cash.

The employee was not injured.

Police say the investigation is ongoing.

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Information from: Argus Leader, http://www.argusleader.com