A Dorchester man was arraigned today for allegedly punching and pushing three women – including a pregnant woman and his own ex-girlfriend – on an MBTA Orange Line train yesterday, Suffolk County District Attorney Daniel F. Conley said.

ANTWAUN D. THOMPSON (D.O.B. 2/7/86) is charged with two counts of assault and battery and one count of aggravated assault and battery for punching a former girlfriend, a 22-year-old Roxbury woman, and two of her friends, a 28-year-old Dorchester woman who is eight-months pregnant and a 21-year-old Boston woman.

Special Assistant District Attorney Matthew McGarry requested that the defendant be held on $20,000 cash bail; Boston Municipal Court Judge Mark H. Summerville set bail in the amount of $8,000, and imposed an additional $500 cash bail on the defendant for an open probation warrant issued out of the Dorchester District Court. He was further ordered to stay away from and have no contact with the three victims.

Prosecutors say Thompson’s former girlfriend and two of her female friends were waiting on the Haymarket MBTA station platform for an inbound orange line train at about 2:30 yesterday afternoon when they saw the defendant also waiting for the train. The three moved down the platform away from the defendant so that they could ensure that they would board a different train car from the defendant.

Thompson is said to have exited his train car at Downtown Crossing and boarded the train car occupied by the three victims.

The victims later told MBTA Transit Police that Thompson began shouting at his former girlfriend as he entered the train car. When her pregnant friend attempted to separate the defendant from the victim, Thompson allegedly punched her in the back.

Thompson then allegedly began to punch his former girlfriend in the head and face with a closed fist. When another female friend of the two women approached Thompson and yelled at him to stop the assault, he allegedly pushed that woman down on the floor.

An unknown male party with no connection to the victims or the defendant intervened and subdued the defendant by holding him up against a wall until MBTA Transit Police officers arrived on the platform.

Witnesses later corroborated the victims’ sequence of events, and the three victims identified Thompson as their attacker.

Conley urged victims of any crime, including intimate partner violence, to call 911 in an emergency. SafeLink, a statewide domestic violence hotline, can be reached at 877-785-2020. SafeLink is answered by trained advocates 24 hours a day in English, Spanish, and Portuguese, as well as TTY at 877-521-2601. It also has the capacity to provide multilingual translation in more than 140 languages.

Thompson is represented by attorney Sean Donahue and is expected to return to court on March 23.