An investigation into a disturbing attack involving a woman in her 70s who was sexually assaulted in a Norwich underpass has been closed.

The victim was walking along Chapelfield Road/Queens Road underpass, towards St Stephen's Street exit at about 1.10pm on August 17 last year when the attack happened.

The victim was touched inappropriately by a suspect who left the area with another man and was seen outside Iceland on St Stephen's Street.

The incident was described as a 'particularly disturbing attack' by PC Jamie Willetts, who urged anyone with information to come forward.

But a Norfolk Police spokesman said the investigation had been closed unless any new information came to light.

The spokesman said: 'All lines of enquiry have now been exhausted and the investigation has been closed, however should any new lines of enquiry come to light they will be investigated.'