MBTA Transit Police have arrested a man and two women for allegedly beating and kicking a mentally disabled man on the Downtown Crossing Station Orange Line platform early Monday, officials said Tuesday.
Authorities said Carlito Rezende, of Dorchester, a 40-year-old man with schizoaffective disorder who has a restricted ability to communicate with people, injected himself into a conversation he overheard, telling a group of people not to use the word “hate.”
The suspects, described in the Transit police report as two men and two women, allegedly responded by punching and kicking Rezende, whom an officer discovered lying on the platform.
“His clothes were in disarray, his shirt torn off him, and [he] was missing one sneaker,” the report read. “He also had numerous cuts, scrapes, severe bruising/swelling, to his facial area and upper torso.”
Rezende was taken to Tufts Medical Center where he was treated and released, according to the report.
Though the suspects fled after the attack, which occurred shortly before 12:37 a.m., four people fitting their descriptions were later seen on video surveillance, according to the report.
Two of the suspects, Karen Akiba, 22, of Cambridge, and Bryon Lashus, 32, of Watertown, pleaded not guilty Tuesday at their arraignments in Boston Municipal Court to charges of assault and battery on a disabled person and assault and battery with a dangerous weapon, authorities said.
Their lawyers could not be reached for comment Tuesday.
Transit police detectives arrested a third suspect, Maryanne Hamilton, 29, of Jamaica Plain, on the same charges on Tuesday after they saw her in the courthouse hallway following the arraignments of Akiba and Lashus, officials said. Hamilton is scheduled to be arraigned on Wednesday.
Judge Patricia Bernstein set bail at $2,000 cash for Akiba, according to Suffolk District Attorney Daniel F. Conley’s office. Bernstein released Lashus on personal recognizance after his lawyer said he is assisting in the investigation, Conley’s office said.
The judge ordered Lashus to stay away from the victim and any witnesses and to have no contact with them, according to the district attorney’s office.
Officials said on Tuesday the investigation is ongoing and police are trying to determine the whereabouts of anyone else believed to have been involved.
Joseph O’Connor, MBTA Transit Police superintendent-in-chief, said the attack was unwarranted.
“It was nothing to rise to the level of the person being assaulted,’’ O’Connor said Tuesday of Rezende’s comments to the group. “It was really small talk that was occurring on the platform.’’
Rezende “lacks the capacity to really engage them in a real conversation,” O’Connor said.
Rezende and his family could not be reached for comment Tuesday.
After the incident, Rezende had difficulty explaining to an officer what had happened, according to the report.
“He could not tell me what happened to him other than he got ‘jumped,’ ” the report read. “Further, he couldn’t give me a description of his attackers. Through further conversation, he was able to tell me that he got into a verbal argument, just prior to being jumped, with an unknown woman.”Globe correspondent Melanie Dostis contributed to this report. John R. Ellement can be reached at firstname.lastname@example.org. Travis Andersen can be reached at tandersen@globe. Follow him on Twitter @TAGlobe.