A Roxbury teen faces serious charges after authorities say he took part in a group beating of an MBTA Orange line train passenger.

Mannice Mitchner, 18, allegedly first recorded the assault by a group of juveniles on an 18-year-old male victim before he then decided to join in by kicking the victim in the head.

“This was a frightening experience for this young man and for all the riders who witnessed it. These arrests and prosecutions should serve as warnings to other potential transit offenders — surveillance cameras are in place throughout the system and you will be seen and caught,” Suffolk District Attorney Kevin Hayden said.

Mitchner — already the subject of open cases in West Roxbury, Fall River, Roxbury, and Dorchester — now faces charges of unarmed robbery, assault and battery with a dangerous weapon, and disorderly conduct on a public conveyance. Authorities say they reviewed MBTA security cameras and have so far also arrested three of the five original attackers.

Police say that seven teens boarded the Orange Line at Downtown Crossing station in Boston. Five of them then confronted the passenger, who later told investigators he didn’t know any of them, and then began punching him with closed fists. They then threw him to the ground and continued to punch and kick him. That’s when Mitchner, who was not a member of the initial group, allegedly landed his own kick.

Police find 2 dead in Fairhaven home

Authorities found two people dead in a Fairhaven home Wednesday evening.

Police and EMS personnel were dispatched to 22 Jameson St. for a welfare check at around 7 p.m. on New Year’s Eve. Inside, they found the bodies of 60-year-old Rafael Pedraza and 51-year-old Brenda Rosario, both of Fairhaven.

Police say there was no sign of forced entry and that drug paraphernalia and suspected narcotics were present.

“Based on the preliminary investigation, police believe this was an isolated incident and there is no threat to the public at this time,” the department wrote in a statement.

Incident Summary

BPD responded to 193 incidents in the 24-hour period ending at 10 a.m. Thursday, according to the department’s incident log. Those included seven aggravated assaults, one residential burglary, two thefts from a vehicle, one auto theft, and 19 incidents of miscellaneous larceny.

Arrests

All of the below-named defendants are presumed innocent until proven guilty.

— Jeffrey Sharp, 48 Clinton St., Taunton. Breaking and entering a vehicle in the nighttime for a felony.

— Robert Barboza, 30 General Lawrence J. Logan Way, South Boston. Vandalizing property.

— Jose Gorgas, 112 Southampton St., Roxbury. Arson — burning a building.

— Pascal Innocent, 221 Walnut Ave., Boston. Operating a motor vehicle with suspended license.

— Brian Fitzpatrick, 526 Park St., Dorchester. Assault and battery on a disabled person or person over 60.

— Yazeed Alanazi, no address listed. Disorderly conduct.

— Chase Johnson, no address listed. Disorderly conduct, subsequent offense.