West Yorkshire Police say they are investigating 76 offences related to the former children's TV presenter Jimmy Savile.
Former patients at the Leeds General Infirmary, Dewsbury and District Hospital, High Royds Hospital and St James Hospital in Leeds allege they were abused by the Jim'll fix it star.
More top news
Cool in the north, warmer air to the south
Police have warned the drug, known locally as "pink champagne", could be deadly.
The author said "It's been wonderful" as fans mark two decades since the children's books opened up a world of magic to millions.