POLICE want to trace a key witness after a serious sexual assault at 1.30am on July 11 in Abergavenny.

A woman was walking towards the castle grounds with an unknown man. She was assaulted and fled towards Cross Street.

She then spoke to a white man, in his 20s, outside a takeaway, who helped her and escorted her home.

A police spokeswoman said, "This person is not a suspect, but police would like to speak to him for further information or anyone who knows him." Anyone with information should contact 101.

A 19-year-old man from Bristol was arrested in connection with the incident and is on bail pending further enquiries.