Police have launched an investigation into a sexual assault in Norwich.

Officers were called shortly after 5am on Sunday, July 4 following reports that a woman had been assaulted in the city centre.

Norwich Evening News: Police vehicles at an area of the old Rose Lane car park in Norwich.Police vehicles at an area of the old Rose Lane car park in Norwich. (Image: Simon Parkin)

An area in the old Rose Lane car park, off Mountergate, was sealed off as officers began an investigation.

A cordon was placed around part of a yard behind the new multi-storey Rose Lane car park.

Several police vehicles were at the scene throughout Sunday and officers could be seen in an area leading to the yard beside industrial units that were formerly car workshops.

Norwich Evening News: The police investigation centred on an area behind industrial units on Mountergate in Norwich.The police investigation centred on an area behind industrial units on Mountergate in Norwich. (Image: Simon Parkin)

A silver Skoda hatchback car was parked inside the area that had been cordoned off.

Police said the cordon had been lifted around 4.20pm on Sunday afternoon but that enquiries are ongoing.