Yorkshire Ripper Peter Sutcliffe could be put back on trial as part of a major new police probe into at least THIRTEEN more suspected victims.

Detectives have already visited two women who survived unsolved brutal attacks during his five-year reign of terror. They asked for statements and DNA samples.

The cold case investigation, confirmed by the West Yorkshire Police, is believed to focus on censored files in a top-level 1982 government report which was not published until 2006.

It concluded that Sutcliffe – jailed for life in 1981 for the murder of 13 women and attempted murder of seven others – was “probably responsible” for many more attacks he had not admitted.

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Sutcliffe, now 69, struck twice in Huddersfield, killing teenager Helen Rytka in Great Northern Street and leaving Theresa Sykes for dead at Oakes. The police operation to catch him was the most extensive and controversial investigation of the 20th century.

He was arrested with a prostitute in Sheffield in January 1981 while in a car with a false number plates, stolen from Mirfield.

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Potential other victims include Maureen Lea, a 20-year-old Leeds University student, who was attacked in October 1980 as she walked home following a night out.

Others include Tracy Browne, who was attacked in Silsden, in August 1975 when she was just 14, and Gloria Wood, attacked on a school playing field in Bradford.

Helen Rytka, 18, victim of Peter Sutcliffe, ' The Yorkshire Ripper'. February 1978.

A police spokesman said: “We are continuing with an ongoing process to review non-recent undetected offences… in conjunction with theHome Office under the ­requirements of the Public Records Act.

“As part of this review, officers have begun to visit a small number of people named as victims of then unsolved assaults and other offences in cases submitted to West Yorkshire Police as part of reviews carried out in the early 1980s.

“Should any new lines of enquiry be identified, they will be comprehensively pursued.”

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The cold case review is believed to involve files contained in an unpublished section in the 1982 ­government report into the Ripper killings by former Inspector of Constabulary Sir Lawrence Byford.

At his trial, Sutcliffe pleaded not guilty to his crimes on the grounds of diminished responsibility and claimed God had told him to do it.

He has been in Broadmoor since 1984 after being diagnosed with paranoid ­schizophrenia, but he now faces the ­prospect of being sent to a normal prison after being declared sane.