The Ibrox Disaster: 40 Years On

Rangers v Celtic 2nd January 1971. 66 lives lost.

From the National Library of Scotland Digital Archive (the Herald's original coverage):

FIRST WARNING OF THE TRAGEDY . . .
DISTANT SOUNDS OF SCREAMS IN MIST
In the press box we had all been commenting on how well behaved the crowd had been and thinking that Rangers' equaliser in the closing seconds had restored the good nature of their fans, ensuring that there would be no subsequent trouble.