Police are investigating an assault which occurred at about 9.50pm on the 4th April in the Langrigg Road area of Carlisle.
A woman was walking home when the incident happened.
A Cumbria Police spokesman said: “The unknown offender approached her on a bicycle. He is described as wearing all dark clothing and a head torch and spoke with a local accent.”
Anyone with information is asked to call PC 2423 on 101, or call Crimestoppers anonymously on 0800 555 111, quoting log 31 of the 5th April.