A quick-thinking Uber driver is being credited with stopping a scam targeting an elderly woman in Sedona, Ariz.

Investigators say a woman in her 90s had received a call from someone posing as a Wells Fargo representative. The caller claimed her accounts had been hacked and instructed her to hand over her debit cards to a courier.

Before that could happen, an Uber driver named Michael arrived after receiving a ride request for a passenger listed as Sam. When the woman approached him with a bag and asked if he was the courier, Michael immediately became suspicious.

Drawing on his experience as a retired police officer, he recognized the signs of a scam and urged the woman not to go through with it. Even though the scammers told the woman to keep the situation confidential, she listened to Michael. He stayed with her to ensure she was safe until help arrived.

The sheriff’s office reminded the public to stay alert for similar scams. Officials say criminals often pose as legitimate banks, use spoofed phone numbers, create a sense of urgency and instruct victims to keep the situation secret while waiting for a courier.