SIOUX FALLS, S.D. -

Three teenage boys have been arrested after being suspected of robbing a Sioux Falls gas station early Sunday morning.

According to Public Information Officer Sam Clemens, police were dispatched to the Casey's General Store at 901 East Benson Road at 5:30 a.m. to respond to the robbery. Clemens says that two boys entered the store, one of them being armed with a stolen rifle and pointed it at the clerk. The boys stole cash and left the scene.

A witness saw a car parked nearby that seemed out of place and gave police part of the license plate number. Officers later found the vehicle at the Happy Rest Motel. While investigating the vehicle, Clemens says that the rifle used in the robbery was found. The rifle had been stolen from an unlocked car in Sioux Falls at 73rd Street and Tomar Road last week along with a shotgun.

Clemens says a SWAT team and negotiators were called to the hotel to get the boys to come out of the room. Three boys ages 14, 16 and 17 were arrested on first-degree robbery charges and possession of stolen property.

Clemens says through the investigation, it was found that the 16-year-old boy drove the vehicle away from the scene, while the other two boys went inside. Clemens says that the 14-year-old boy was the one that was armed with the rifle. He has also been charged with two counts of aggravated assault.

“We’re still trying to figure out how a 14-year-old can get their hands on a stolen rifle," Clemens says.

The shotgun also stolen from the car has yet to be found.

Clemens says that the 14-year-old and 17-year-old boys were currently on probation and did not have contact with their probation officers.

It is unclear whether or not the three boys will be charged as adults for their crimes.