A third person has been charged in connection to a shooting outside of Forest Hills Station on Friday morning during the rush hour commute. 

Robert Acosta, 18, was arraigned on Tuesday, was arraigned in West Roxbury Court on Tuesday. Keisean Parker, 18, of Roxbury and Kevasia Lowe, 18, of Mattapan were arraigned Monday.

Prosecutors sad Parker got into a verbal altercation with several people on a bus before the alleged shooting. The argument spilled out onto the street after the bus pulled into Forest Hills Station at about 8 a.m., prosecutors said.

Parker allegedly pulled out a gun, opened fire and fled towards Asticou Road and Washington Street. A second man returned fire. There were no reports of injuries. 

Lowe allegedly threatened one victim with a Taser device during the altercation, prosecutors said.

Boston and Transit Police officers interviewed witnesses and victims and found spent shell casings in the area where the shots were fired. Police detained Parker and Lowe not far from the scene, and a witness positively identified Parker as the gunman. A gun and a Taser were found in Lowe’s backpack upon arrest, prosecutors said.

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Acosta was later identified through camera footage. 

Parker was arraigned on charges of unlawful possession of a firearm, unlawful possession of ammunition, discharging a firearm within 500 feet of a building, and assault with a dangerous weapon.  

Lowe was arraigned charges of unlawful possession of a firearm, carrying a dangerous weapon, and assault with a dangerous weapon. Prosecutors requested that each be held on $100,000 and orders that each wear a GPS monitor, abide by a curfew, stay away from Forest Hills, and stay away from each other and all witnesses and victims in the event either is released on bail.  

Judge Ernest Sarason imposed bail of $15,000 and ordered Parker and Lowe to abide by a curfew and stay away from witnesses and victims. He also ordered Parker to stay with a family member outside of the city and to stay away from Boston except to attend court dates.

At Acosta was arraigned on charges of unlawful possession of a firearm, unlawful possession of ammunition, discharging a firearm within 500 feet of a building, and assault with a dangerous weapon, prosecutors requested bail of $100,000 and the same conditions requested at Parker’s arraignments. Judge Sally Kelly imposed $25,000 bail and the requested conditions of release.

The three will be back in court on November 12.