YANKTON, S.D. (AP) - Three Yankton men are in custody in connection with the armed robbery of a convenience store in Sioux Falls.

Two of the suspects are 18 years old and the third is 20. Sioux Falls police received a tip about them, and officers in Yankton arrested the men without incident Monday during a traffic stop.

Two of the men allegedly robbed Casey's General Store and one of its customers at knifepoint late Sunday, fleeing with an undisclosed amount of cash. The third suspect allegedly was the getaway driver.

The suspects were arrested on charges of robbery and possessing stolen property. Police did not disclose details about the alleged stolen property.