Players from the Glasgow-based team and their opponents from Livingston lined up to for a two-minute silence in honour of the Duke of Edinburgh ahead of the kick-off this afternoon. But as the teams and match officials stood around the centre circle, fireworks could be heard being set off outside the stadium.
The noise of the fireworks was picked up on radio broadcasts and Celtic TV’s coverage of the game.
Police confirmed and inquiry into the incident was underway.
A Police Scotland spokesman said: “We are investigating the misuse of fireworks outside Celtic Park stadium on Saturday, 10 April, 2021.
“Inquiries into the incident are ongoing.”
Earlier, hardline Scottish nationalists sparked outrage on social media by posting tweets celebrating the death of Prince Philip – directly below Nicola Sturgeon’s heartfelt tribute.
Ms Sturgeon said: “I am saddened by news that the Duke of Edinburgh has died.
“I send my personal and deepest condolences – and those of the Scottish Government and people of Scotland – to Her Majesty The Queen and her family.”
But some extreme nationalists objected to the First Minister’s statement with some even celebrating Prince Philip’s death.
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One said: “Don’t include the people of Scotland in your message, good riddance to him.”
Another said: “I love you Nicola but I’m afraid I couldn’t care less.”
Another commented: “Nothing to do with us, not my monarchy and never will be.”
And another stated: “I honestly don’t care. Didn’t know him, didn’t care for his family.”
He continued: “But on the other hand, in a weird way when I was there whilst it was disrespectful, as someone like Prince Philip who was born in Greece, I was born in Iran and kind of growing up here.
“The fact that people are free and able to do that, to be disrespectful without being punished by the state or by the police that gave me hope for the future.”