Police believe Moors murderer Ian Brady has revealed details about the location of the body of one of his victims.
It is thought Brady has disclosed the whereabouts of 12-year-old Keith Bennett - who has never been found - to one of his long-term visitors, Greater Manchester Police said in a statement.
The force added that a 49-year-old woman has been arrested in South Wales on suspicion of preventing the burial of a body without lawful exercise and remains in police cistody for questions.
A Greater Manchester Police spokesman said: "On 30 July 2012, Greater Manchester Police received information that led officers to believe that Ian Brady had recently given details of the location of Keith Bennett's body to one of his long-term visitors.
"Officers in the cold case unit made inquiries to accuracy of this report and have since had extensive contact with Ashworth hospital and Keith's close family.
"As a result, warrants obtained under the Police and Criminal Evidence Act were executed at Ashworth hospital and a private address in South Wales today.
"A 49-year-old woman has been arrested in South Wales on suspicion of preventing the burial of a body without lawful exercise and remains in police custody for questioning. Searches of both locations are ongoing."
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