Sioux Falls Police Officer Sam Clemens says authorities are searching for a robbery suspect.

"A guy and his former girlfriend were driving around. She was actually driving the car because he was from out of town and didn't know his way around Sioux Falls. They ended up around 10th and Duluth. Once she stopped the car, the girl got out and was talking with another guy. After sometime, our victim, who was still inside the car, yelled at them wanting to know what was going on. She came back to the car and took her baby inside an apartment. As soon as she left, the guy she was talking too pulled out a kitchen knife and threatened our victim. He wanted the victim's wallet. The victim handed over the wallet and then took off running."

Clemens says the victim's car was found along with the wallet. But, the cash was missing.

Police know who the suspect is but haven't found him at this time.

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