"I am very shocked and saddened to learn this evening that a large number of football supporters have died or been injured," said Blatter in a statement. "This is a black day for football. Such a catastrophic situation is unimaginable and should not happen. "My thoughts are with the families of those who have lost their lives this evening. "This is a black day for football. Such a catastrophic situation is unimaginable and should not happen." A security official said the violence erupted as soon as the referee blew the final whistle. Fans of Al-Masri, who beat Al-Ahly 3-0, invaded the pitch and began to throw rocks, bottles and fireworks at the Al-Ahly fans. "The death toll, as a result of the unrest after the match between Al-Ahly and Al-Masri, has reached 73," Egypt's deputy health minister Helmy al-Efni said.