UPDATE, 12:10 p.m.: The MBTA reports three of the four have turned themselves in - they walked into Transit Police HQ just as Supt. Joseph O'Connor was briefing the media on the case. More to come.

Transit Police report a man and his 14-year-old daughter were beaten by four men on a Blue Line train around 8:30 p.m. on Sept. 18.

After repeatedly punching the man in the head and his daughter in the thigh, the four sauntered off the train at Airport, police say.

If these guys look familiar, contact detectives at 617-222-1050 or send an anonymous tip to 873873.