A reward of £1,000 has been offered in a bid to find a suspected burglar.
Sussex Police want to interview 38-year-old Simon Peter Knights about several house burglaries and now believe that he is travelling by train along the South Coast and London to Brighton routes.
There were four burglaries and one attempted burglary at addresses in Barnham, West Sussex, during the day on Monday June 16, and a burglary during the day in Park Road, Burgess Hill, on Thursday June 19.
Two addresses in Downview Road, one in Elm Grove and one in Barnham Road, Barnham, were broken into and jewellery was taken. An unsuccessful attempt was made to enter another Barnham Road address.
In the Burgess Hill burglary several hundreds of pounds worth of jewellery was taken.
Knights is white, about 5'8", and has ginger hair and blue eyes.
Detective Inspector David Wardley-Wilkins said: "We have information that Knights travels regularly by train and we are working with British Transport Police to see if we can trace him in that way too."
Officers are also making enquiries in East Sussex and in the Southend and Basildon areas of south Essex, where Knights is known to have connections.
The reward is offered subject to arrest and conviction for one or more of the offences.
DCI Wardley-Wilkins said; "If you know where Knights is please contact Sussex Police via 101 or email firstname.lastname@example.org quoting Serial 840 of 16/06. You can also contact the independent charity Crimestoppers anonymously on 0800 555 111."