COLORADO SPRINGS, COLO. -- Colorado Springs Police officers arrested one man and are looking for two others accused of robbing a third man after the victim had withdrawn money from an ATM machine.

Officers said two men approached the victim at the Wells Fargo Bank in the 4100 block of North Academy Boulevard in the city around 11:40 p.m. Sunday. The victim had just withdrawn money from the ATM when one of the men pressed a pistol into his back and demanded his money.

The men fled on foot and were chased by a witness. As they ran, one of them dropped a gun, which turned out to be a BB gun. The witness said the two men entered a grey car driven by a third man. Officers found the car abandoned at a nearby bowling alley.

Officers found the car owner, 19-year-old Sloan Gross, on foot near the bank and arrested him. He faces robbery charges.

Officers are continuing the investigation.