A 15-year-old Boston girl is accused of assaulting and injuring an 84-year-old man at the Forest Hills MBTA station, according to the Suffolk County District Attorney’s Office.

The girl was ordered held for 60 days after being charged on Thursday in West Roxbury Juvenile Court. She has been charged with assault and battery with a dangerous weapon (shod foot) on a person over 65.

The alleged assault happened on Tuesday at about 8:54 p.m., when MBTA police responded to the upper busway at Forest Hills station for a report of a man being assaulted and injured.

When police arrived, they found the 84-year-old man on the ground bleeding from his forehead. Three MBTA riders — two doctors and a medical student — were seen helping the victim.

The victim, who remained conscious after the assault, was transported to Brigham and Women’s Hospital for evaluation and treatment.

Police at the scene learned that the man had been assaulted by a group of juveniles, the DA’s Office said. Video surveillance showed a group of boys and girls exit a bus, and congregate at the station’s entrance.

As the man walked by the group, several juveniles began to walk closely behind him. Then a girl kicked the man’s legs and tripped him, causing him to fall on his forehead.

Police were able to identify the girl through surveillance video. Then on Wednesday afternoon, MBTA police saw her walking toward the JFK/UMass MBTA station, and they arrested her.

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“The quick work by MBTA police in identifying and apprehending the juvenile responsible for this entirely unprovoked attack sends a direct message to anyone contemplating such intolerable crimes — you will be identified, you will be arrested, and you will be prosecuted,” DA Kevin Hayden said.

The judge ordered $500 bail on the new charge, and an additional $500 bail on an existing unarmed robbery charge. The judge ordered the prior bail revoked for 60 days, and also ordered the girl to stay away from the victim, stay away from Forest Hills station, and submit to GPS monitoring.

She will return to court on Dec. 4 for a probable cause hearing.