POLICE officers are appealing for four key witnesses to come forward following a serious sexual assault which reportedly happened on the grounds of Truro Cathedral.

The incident is believed to have happened sometime between 11.30pm on Friday, March 15, and 12.30am on Saturday, March 16.

DC Amanda Gilbert said: “Police received reports that a woman had been sexually assaulted on the grounds of the cathedral when on a night out with friends.

“A group of young males, who were close to where the incident took place, alerted the victim’s friends by calling them over telling them that the victim needed their help.

“We wish to identify these boys as we believe they may have information which could help us with our investigation.

“The group of males are described as being around 16 to 17 years old and were wearing grey jogging bottoms.

“Three of the boys had dark/black coats on. The fourth boy had an orange jacket on with a sling bag over his shoulder.

“The boys all had similar light/brown hair which was thicker on top and short on the sides.”

Anyone with information should contact police by calling 101 quoting 50240067481.

Information can also be passed anonymously to independent charity Crimestoppers.