A man with dementia who went missing from his home in Aintree has now not been seen for a week.
There was also a reported sighting at 3pm on the same day, outside Maghull Chiropodists.
Mr Kerevan is a keen walker, and specialist officers have spent the weekend carrying out "extensive" searches of the routes he liked to take.
Police say they have been focussing on areas around Aintree and Maghull - as Peter would often walk the towpath of the Leeds Liverpool canal.
Detective Inspector Paul Gillies has thanked member of the public who have volunteered to help with the search for Peter, adding "I know his family are extremely grateful."
Anyone who believes they may have seen Peter or someone who resembles his description is asked to call 101.
- 6ft tall
- slim build
- when last seen he had short grey hair and stubble
- when last seen he was wearing a short-sleeved dark blue shirt and carrying a dark-coloured cardigan
- reportedly wearing blue jeans and brown shoes