A Somerville man was seriously injured in a stabbing early Saturday morning, according to Middlesex County District Attorney Marian Ryan.Police responded to reports of a person on the ground near the intersection of Broadway and Hinkley Street at 1:25 a.m. Saturday. Officers found a man suffering from life-threatening injuries at the scene, according to Ryan. He was taken to Massachusetts General Hospital.The man was identified only as a 27-year-old Somerville resident. Preliminary investigation shows the victim was stabbed on Hinkley Street and then walked to Broadway where he collapsed, according to Ryan. According to investigators, the victim was seen walking with another individual before the stabbing."Anyone who may have seen something in the area of the Dunkin Donuts store on Broadway early this morning is asked to come forward in order to assist in apprehending the person or the people responsible for this crime,”  Ryan said in a statement.