Christopher Casey, 22, of Dorchester, will be arraigned today in connection with a Monday double stabbing at the Park Street T stop, according to the Suffolk County DA's office. He faces charges of aggravated assault and battery with a dangerous weapon, assault and battery with a dangerous weapon and carrying a dangerous weapon.

Officials say they are looking for other suspects in the incident, in which two people were stabbed after a fight on the steps leading from the Red Line to the Green Line around 11:45 p.m., Monday.