SUMMERVILLE -- The victims reportedly wanted to buy a $20 bag of marijuana. The 16-year-old in the car allegedly stuck a pistol-grip shotgun out the window and demanded the cash instead.

That's what an incident report said happened in the Greenhurst community Wednesday night, leading to a tense deputy stop on Trolley Road nearby, with officers telling people in the car to put their hands out the windows and on the roof. A juvenile, when questioned, said he wanted to speak to his mother.

Charged with armed robbery, weapons and narcotics violations were John Matthew Fortunato, 21, 125 Ronald Drive, Ladson, and the 16-year-old, whose name wasn't disclosed.

Three teens allegedly were robbed of the $20 just after 10:30 p.m. in the neighborhood off Miles-Jamison Road. When a be-on-the-lookout alert was broadcast for a gray Mustang, Dorchester County sheriff's Deputy Keith Hunt was patrolling on Ladson Road, passed a convenience store and spotted a car fitting the description parked there.

The Mustang drove off and the deputy followed until he confirmed the driver and passenger also fit the description, turned on his blue lights and pulled the car over on Trolley Road.

The driver admitted to the robbery, according to the incident report, and said the juvenile pointed the shotgun. The juvenile denied being involved and demanded to speak to his mother, the report said. After talking to his mother, he admitted the robbery, the report said.

The juvenile retrieved from a body cavity two grams of marijuana, according to the report. A search of the car found a pistol-grip shotgun, shotgun shells, a silver toy handgun with black electrical tape around the grip and two ski masks.

The incident is under investigation.

Reach Bo Petersen at 937-5744.