A hospital has disputed claims by a former porter that Jimmy Savile would regularly take teenage girls to a private hospital block alone.
Terry Pratt said the late Jim'll Fix It star was frequently handed a key to the nurses' accommodation building at Leeds General Infirmary during the late 1980s.
But Leeds Teaching Hospitals NHS Trust said it has investigated the allegations and was "concerned" that Mr Pratt was "mistaken in his comments".
Mr Pratt told the BBC that Savile would arrive at Leeds General Infirmary with the girls in the early hours of the morning and then leave before dawn.
The former porter said: "He would go up and the lad on the desk would say 'Here's the key, Jim, make sure I get it back'.
"He'd take the key and would walk out and the two women would follow him towards the nurses' home."
A spokesman for Leeds Teaching Hospitals NHS Trust said: "We are concerned to hear the allegations which have been made by Mr Pratt and have been quoted widely in the media.
"We have investigated his claims today with other staff who were around at Leeds General Infirmary at the time and we believe he is mistaken in his comments. Mr Pratt appears to have been talking about a period in the 1980s before he started work at the hospital in 1990 and not from first-hand knowledge.
"The assurance we have been given is that the porters did not have a key to unlock the nurses' home. The building had a warden on duty 24 hours a day and we understand access was very strictly controlled to protect the staff living there.
"The accusations against Savile are serious and naturally are of great concern. The police are continuing their national investigation and anyone with evidence should speak to them."