SEATTLE - Four teens suspected of robbing a business owner at knifepoint Saturday night in West Seattle were arrested less than three hours later after an alert neighbor called 911.

The incident began at about 9:15 p.m. when the businessman closed up shop in the 4700 block of California Avenue SW and began walking to his vehicle parked on 42nd Avenue SW.

Four male teenagers who had been hanging around the area came up and grabbed the victim from behind.

The suspects held a knife to the victim's midsection and robbed him of his daily cash deposit, his wallet and cell phone.

The teens walked back to their vehicle parked around the corner as the victim followed and watched them drive away. The business owner then called 911 to report the armed robbery.

At about 11:45 p.m., a concerned neighbor saw a burgundy vehicle parked in front of his house. The occupants were throwing items out the window.

The neighbor called 911 to report the disturbance. Officers quickly arrived and saw that the vehicle and occupants matched the descriptions of the robbery suspects. All four were arrested.

Officers said the items thrown on the ground were the victim's credit cards and driver's license. Cash was located on one suspect and another had a check from the victim's business in his pocket.

The victim arrived on scene and identified the occupants in the vehicle as the ones suspected of robbing him.

Three juveniles were booked into Youth Service Center for investigation of robbery. One adult male was booked into King County Jail for investigation of robbery.