Detectives investigating allegations of abuse by former MP Cyril Smith have revealed that 14 men have been questioned under caution.
All of them are former teachers or pupils from Knowl View, a former residential school for boys in Rochdale.
Police say they have been interviewed about a variety of offences, including the sexual or physical abuse of children between 1969 and 1990.
Eighteen victims have come forward alleging they were abused at the school.
Greater Manchester Police say "a handful" claim the offences were committed by Smith.
Detective Chief Superintendent Russ Jackson, said: "The investigation into abuse at Knowl View School continues and since the start of the inquiry further victims have come forward.
“These are serious allegations made against both staff and pupils at the school and are being thoroughly investigated.
“We are currently working through the allegations and as a result 14 people so far have been interviewed under caution.
“Greater Manchester Police takes allegations of abuse very seriously and continues to do so and if anyone has been a victim of abuse, we ask them to contact us.”
Smith, who died in 2010, served as the Liberal and later Liberal Democrat MP for Rochdale between 1972 and 1992.