A 27-year-old Brooklyn man has been indicted on charges of assault as a hate crime for allegedly punching a woman in the face and knocking her unconscious while shouting anti-gay slurs on a subway in May. 

Antoine Thomas, of Flatbush, was arraigned on those and other charges in Brooklyn Supreme Court Monday. It wasn't clear if he entered a plea. 

Authorities say Thomas got on a Brooklyn-bound Q train at Union Square around 7:30 p.m. May 21 and sat next to the victim and her girlfriend. He allegedly began shouting slurs at the couple, aggressively bumping into the victim at one point when the train made a sudden stop. 

When the train pulled into the Dekalb Avenue station in downtown Brooklyn, the suspect punched one of the women in the face, knocking her out, and tried to flee by walking between train cars, the indictment alleges. The conductor called police and Thomas was arrested at the station. 

The victim was treated at a hospital for a concussion, broken nose and a contusion. She also suffered serious cuts to her eye that required eight stitches. 

Information on an attorney for Thomas wasn't immediately available. He faces up to 15 years in prison if convicted of the top count against him.