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Recent calls from Sierra Leone to people in the Tulsa area and around the state are reportedly scams.

The Sand Springs Police Department put out a warning about what’s known as a “wangiri” scam; the original call is placed by an auto dialer, and when a person answers, it disconnects, or a message may ask the person to call back.

“DO NOT CALL BACK. It is an attempt by scam artists to collect money from the call back,” a social media post from the agency says.

The wangiri or “one-ring” scam originally appeared in the U.S. in 2013.

“If the victim calls back, they will be connected to an international hotline charging a connection fee, along with significantly high per-minute fees,” according to Hiya, software that identifies unknown numbers and automatically blocks scam calls and internet spam across the globe.

“Unfortunately, the victim doesn’t realize they’ve been scammed, until they see the premium services on their monthly phone bill.”