Hearts have apologised after The Sash was blared out of the Tynecastle PA system during a FoH open day.
The Foundation of Hearts, the club's majority owners, had threw the doors of the stadium open to fans yesterday as they got a behind the scenes look at the Gorgie ground.
However, the event was soured after the loyalist song was played over the Tynecastle sound system.
Footage emerged on social media showing the incident - with Hearts confirming to Football Scotland that the footage was real and not dubbed or doctored.
Angry Jambos demanded a response and an investigation into the disappointing scenes.
The Scottish Premiership club have now released a statement saying the song "has no place at Tynecastle" and issued a grovelling apology to its supporters.
The Jam Tarts' statement read: "Heart of Midlothian wishes to address an incident that took place at Tynecastle Park on Sunday.
"The stadium hosted the Foundation of Hearts’ Open Day, which celebrated the phenomenal milestone of Hearts becoming the biggest fan-owned football club in the UK.
"Despite the weather, a wonderful day was had by thousands of fans who got to explore Tynecastle, going behind the scenes and visiting areas of the stadium that are rarely seen.
"During the day’s festivities, an incident occurred whereby a song was played over the PA system. The song in question has no connection to Hearts and it has no place at Tynecastle.
"As soon as the club was made aware of the issue the PA system was switched off, the incident investigated and swiftly concluded. Club officials apologised at the time to those inside the stadium who brought the matter to their attention.
"The club would now like to further extend that apology to our wider fanbase after videos of the incident were shared on social media. Procedures have already been implemented that will ensure such an incident is never repeated.
"The FoH Open Day was an extremely proud occasion for the club and we would like to, once again, thank our supporters who continue to back every aspect of the club in tremendous fashion. We look forward to welcoming everyone back to Gorgie for this Saturday’s cinch Premiership encounter with Dundee United."