The bus operator informed officers after he came to a stop to drop off and pick up a passenger he was unable to continue due to several teen aged males standing in front of his bus preventing him from pulling out. Suddenly and without provocation the suspects set upon the operator punching him in the head, neck and facial area. At one point during the assault they attempted to pull the operator through the window. The suspects fled the area in various directions. The operator suffered multiple abrasions about his face.