Teen and pals rob a woman of her moped at knifepoint in Dorchester, he putters away and promptly crashes, police say

Boston Police report arresting a 15-year-old they say was part of a group that set upon a woman on Southern Avenue at Millet Street and stole her moped and purse shortly after 4 p.m. on Sunday.

According to police:

One of the suspects was grabbing at his waistband, which made the victim believe that he was armed. The suspect stole her moped and drove a short distance before crashing. A second suspect stole the victim’s bag.

Officers canvassed the area and observed the group fleeing down Southern Avenue. One of the suspects was clutching his waistband as he ran to the rear of 60 Southern Avenue. Officers exited their cruiser and ran after the suspect. Officers observed the juvenile male throw an unknown item over the fence. Officers were able to place the suspect into handcuffs, and recovered a discarded large kitchen knife.

The teen, too young to have his name released, was charged as delinquent for armed robbery, police say.