Police are urging anyone who believes they were the victim of sexual abuse by former Lib Dem Rochdale MP Sir Cyril Smith to come forward.
Sir Cyril, who died two years ago, is at the centre of allegations he administered punishments to vulnerable children.
The claims were made by Labour MP Simon Danczuk in the House of Commons. The MP said: "Young boys were humiliated, terrified and reduced to quivering wrecks by a 29st bully imposing himself on them."
Similar allegations have been made about Sir Cyril in the past.
– Lancashire Police spokesman
We take matters such as this extremely seriously and anyone who does come forward should do so with confidence that they will be treated appropriately and with sensitivity.
While we believe there was an investigation into allegations against Mr Smith in the late 1960s, no records are now held and it cannot be ascertained whether a file was passed to the Director of Public Prosecutions.
These historic allegations date back more than 40 years and to a time when Rochdale was within the Lancashire Constabulary area. We have not received any new allegations at this stage."
Mr Danczuk told a hushed House of Commons Sir Cyril, aged 82 when he died, was "a political giant" and one of Britain's most recognisable politicians. He claimed authorities were aware of allegations the Lib Dem targeted children, but that a report into the accusations vanished.