It was never called “Bloody Sunday.” For me, that was the Irish thing that happened in the early 70s. The one that brought fame to Berndette Devlin.
I suspect a hoax. I’ve been on that bridge - that is a poor old Southern town that seemed quite innocent to me...
Sunday, Bloody Sunday (John Lennon)
https://www.youtube.com/watch?v=jKJOUo8zuNE
Caution: Screeching Ono in background vocals.