An historic Apprentice Boys’ flag has gone missing from outside St. Columb’s Cathedral in Derry.
The Crimson flag - first hoisted in the early 1700s - disappeared on Monday.
The flag usually flies from a pole erected on the east frontage of the cathedral looking towards the main gates on London Street.
Police say they are looking into what happened.
Dean of the Cathedral Reverend William Morton said CCTV should be able to pick up who was responsible.
“I noticed that the flag was gone in the early hours of Tuesday morning,” he said. “It is extremely disappointing and regrettable for such an important flag to go missing.
“The Relief of Derry Symphony was in the cathedral last week and the place was full of musicians. This is the atmosphere we want. This will have to be replaced and that costs money. The cathedral is a place of openness and we continue to go ahead with that positive attitude.”
Derry’s Deputy Mayor Gary Middleton - himself an Apprentice Boy - voiced concerned at the flag’s disappearance.