Seven teenagers were charged in a brutal beating of a 13-year-old boy outside the Forest Hills MBTA station last month.

“I thank the Transit police for their quick work in identifying the juveniles involved in this frightening assault and I’m grateful for the witnesses who assisted this young victim,” Suffolk District Attorney Kevin Hayden said. “It’s easy for any caring person to imagine the fear this boy must have felt during such a vicious attack.”

Of the seven teenagers charged on Jan. 15, only one of them is identified because the rest are minors. The Suffolk DA’s office announced the charges on Thursday.

Lucas Goncalves-Depina, 18, was charged at the West Roxbury branch of Boston Municipal Court with assault and battery with a dangerous weapon — a shod foot. He was released on personal recognizance and is due back in court on Feb. 21.

Five of the minors were charged with the same thing in Dorchester Juvenile Court and are due back on March 14. A sixth minor will be arraigned later.

MBTA Police met with the 13-year-old victim of the assault at a local hospital following the attack. He told them that he was taking a bus from Andrew Square to Forest Hills station just before 7 a.m. when a girl sat next to him and said she wanted to “fight” him for “spreading rumors” about her.

He exited the bus at Forest Hills, he told police, and she followed him and punched him in the face multiple times. He struggled to get away when a male teen grabbed him and forced him toward the bike path where a larger group surrounded him and beat on him with both fists and foot. Surveillance footage showed as many as 10 teens involved in the beating, according to prosecutors.

Two adults intervened and most of the kids scattered, but “one juvenile would not stop kicking the victim,” according to prosecutors.