Nine people, ranging in age from 15 to 21, are charged with surrounding and attacking a 19-year-old from Mattapan on Parkman Street around 5 p.m. on Monday, kicking and beating him even as he lay on the ground, curled into a ball, according to the Suffolk County District Attorney's office and the Boston Police Department. He was treated for injuries not considered life threatening, the District Attorney's office says.

According to a Boston Police statement, arriving officers found the teen "to be visibly upset (crying), having difficulty breathing and redness around his face and head. He informed the officers that he had just been beaten by approximately ten males. He stated he knew them and they didn't like him."

Police interviewed a witness who said he was brought out of his house by "awful screams" coming from Parkman Street. "The witness looked in that direction and observed the victim curled up on the ground getting kicked and punched by a large group of approximately ten (10) black males. The witness went on to state that all the parties were involved in the beating."

Police say the responding officers put out a description of the pack and that officers quickly found them, still on Parkman Street.

Among those charged: Trevon Cambpell, 17, of Dorchester, Johnny Clark, Jr., 20, of Dorchester, Markees Finklea-Sonlyen, 17, of Dorchester, Jahsia Solomon, 17, of Roxbury, Stephen Goss, Jr., 18, of Dorchester, Aldane Hall, 21, of Dorchester and Dillon Copeland, 17, of Dorchester. A 16-year-old and a 15-year-old, both from Dorchester, were also charged, but not identifed because of their age.

Because the victim is developmentally disabled, all nine face up to five years in state prison for assault and battery - double the normal maximum sentence - the DA's office says. They are scheduled for arraignment in Dorchester District Court.