McDonald's has issued an apology for a Halloween advert using the slogan 'Sundae Bloody Sundae'.
The poster, which has caused outrage on social media, was posted by a customer who spotted it in one of the fast-food outlets branches in Portugal, Belfast Live reports.
Posting a photo of the advert on Twitter, the customer captioned the picture: "Portugal is cancelled."
Thirteen people were killed and 15 people wounded after members of the British Army's Parachute Regiment opened fire on civil rights demonstrators in the Bogside area of Derry on Sunday 30 January 1972.
The day became known as 'Bloody Sunday', one the darkest days of The Troubles in Northern Ireland.
A spokeswoman for McDonald's said: "When promoting its Halloween Sundae ice cream, McDonald's Portugal developed a local market activation for a small number of its restaurants in Portugal.
"The campaign was intended as a celebration of Halloween, not as an insensitive reference to any historical event or to upset or insult anyone in any way.
"We sincerely apologise for any offence or distress this may have caused. All promotional material has been removed from restaurants."
