Police have opened an attempted second-degree murder, second-degree assault and first-degree assault on a law enforcement officer investigation after three men, including a police officer, were injured Saturday night.  Police were called to a large affray on Liliha street just after 10:30 p.m. Saturday.  When they arrived, about 50 people were fighting in the street. A 21-year-old man was stabbed, another 25-year-old man had a puncture wound to his shoulder and a 51-year-old police officer who was trying to disperse the crowd, was struck from behind. All three victims went to the hospital in stable condition.  The suspects remain at large.