Twenty people have now come forward to claim they were victims of sexual abuse by Sir Cyril Smith.
At least one victim has told detectives he was raped by the 29-stone politician, whose alleged child sex abuse activities at Knowl View School, a children's home in Rochdale, spanned nearly three decades.
Smith is alleged to have preyed on youngsters both at Knowl View, where five complainants have come forward, and another school in Rochdale for difficult children, Cambridge House, where 10 complainants have spoken to police.
Another five say they were abused at various other locations, all in the Greater Manchester area.
Police are now discussing with lawyers the charges Smith would have faced if he was still alive, to give "closure and clarity" to victims.
All the offences are said to have happened between 1960 and 1987.
Smith, who died in 2010, was the subject of allegations and investigations over decades during his career, first as a prominent local councillor in Rochdale and later as the town's Liberal MP. He was never prosecuted.
Detective Chief Superintendent Russ Jackson, of Greater Manchester Police (GMP), said today: "We are committed to understanding the enormity of Cyril Smith's misconduct and working to try to understand that, and thereby, provide a picture of the extent of his offending, and with the CPS (Crown Prosecution Service) to get to a position of what we would have done had he still been alive, and thereby provide that understanding to the victims who have gone through such a horrid time."