I remember that incident.

My cousin died in that mayhem.  He was crushed by the crowd at the gate of the stadium.  We found his body in the Bir Hospital corridor.

From what I heard, it was Sarad Chandra Shah - then Chief of Sports and Dasrath Rangasala - who was the main culprit.  He specifically ordered the gates to be closed and locked because he feared people might leave as the game was rather lackluster.