The altercation originated on the bus apparently between two opposing groups. The confrontation spilled out onto the street where the slashing and bleach attack occurred. The incident is currently under investigation by Transit Police detectives. If you have any information relative to the event please contact our Criminal Investigation Unit at 617-222-1050. If you would like to assist our investigators but wish to remain anonymous simply text us your tip to 873873 or use the anonymous feature of our SeeSay App.