(AP) — Police say a bank teller stopped a customer from being conned into withdrawing money to prove U.S. banks are safe.

Lt. Doug Nolte says the ruse was foiled when the 19-year-old customer at Commerce Bank in Wichita explained what he was doing to the teller, who then called 911. The con artists fled, likely after becoming suspicious when their intended victim stayed so long inside the bank.

One of the suspects had claimed he was from South Africa where his brother had left him $150,000. He offered to donate money to the victim’s church in exchange for withdrawing money.

Police want to hear from anyone else who may have been victimized, noting that the scam has been used in the past.