ROHNERT PARK, Calif. (AP) — Authorities say a man tried to rob a car wash in Northern California with an empty potato chip bag and an alleged handgun.

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Rohnert Park’s Department of Public Safety says in a statement that the man entered KaCees World of Water car wash Friday night and dropped an empty potato chip bag on the counter.

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He told the cashier to fill it with money, warning that he had a gun.

The man gestured that the weapon was in the empty bag, but the cashier saw it held only a piece of cardboard and called a co-worker for help.

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Police say when the other employee approached, the suspect fled on foot.

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