The incident happened just after 8:30 a.m. on Monday. A video from a witness shows the man who has been identified as Timothy Barbee hitting Rakitin across the face, sending his glasses flying.

Police in New York City are asking for the public's help in identifying a suspect who slashed another man in the face when he tried to intervene in a fight aboard a Brooklyn subway train last week.

EAST VILLAGE -- What started as just an average morning commute in New York turned ended in an assault case. Allex Rakitin said he was on the N train heading to work at 8:30 a.m. on Monday ...