The home of TV weatherman Fred Talbot has been raided by police as part of an investigation into historic sexual abuse, sources said.
The alleged offences relate to sexual abuse in the early 1970s while the victims were pupils at Altrincham Grammar School for Boys.
Greater Manchester Police said a number of warrants were executed on December 11 but no arrests have yet been made.
Police sources said three separate complaints about alleged historic abuse had been received. Talbot, 63, a former biology teacher at the school, is understood to be away from his home in Bowdon, Greater Manchester, and is out of the country.
He is best known for his colourful appearances on the weather map for ITV's This Morning programme when hosted by Richard Madeley and Judy Finnigan at Liverpool's Albert Dock. Talbot remains the weatherman on the station's North West regional news programme Granada Reports.
Police said their investigation was prompted following media reports of another probe into historic sexual abuse at a Catholic boys' school in Altrincham. Last month, a 63-year-old former teacher at St Ambrose College in Hale Barns was held on suspicion of indecent assault of an ex-pupil and possession of indecent images dating back to the early 1980s. He was later bailed pending further inquiries.
The offences under investigation at Altrincham Grammar School for Boys did not happen within school grounds but allegedly involved a member of staff at the time, police said.
Chief Superintendent Mark Roberts said: "While I must stress that once again these relate to historic allegations, it is incumbent on us to thoroughly and robustly investigate this matter. We currently have a dedicated phone line for anyone wanting to report any incidents in relation to these two ongoing but separate investigations and I would urge anyone with any information or who wishes to report any incidents to contact us in absolute confidence."
Anyone with information should call police on 0161 856 7555, or Crimestoppers, anonymously, on 0800 555 111.
An ITV spokesman said: "Given that there is a police investigation, it would not be appropriate for us to comment."