The lights at the stadium were abruptly turned off and the exit doors closed during the melee, forcing a stampede down a narrow corridor. The stadium gate, which was locked from the outside, was forced open by the crowd. Dozens were crushed to death there, including fans of Al-Masry. The youngest victim was 14 years old.
Prosecutor Mahmoud al-Hennawy said the attack that night was "planned" both by Al-Masry fans and thugs.
"The cutting off of the light in the stadium was intentional, and the proof is that Al-Ahly fans were thrown off bleachers and the main cause of deaths were the presence of thugs," al-Hennawy said.
Some of the defendants face murder charges. The officers have been charged with assisting the attackers. They could face up to 10 years in prison.
Most of the victims were from Al-Ahly's "Ultras", an organization of the club's most hardcore fans.
Some believe the security forces stood by to punish the Al-Ahly Ultras for their high-profile involvement in the uprising against Mubarak and in subsequent protests against Egypt's military rulers.
Others attribute the violence in Port Said to negligence. Security forces at the stadium did little during the attack. Beforehand, they failed in routine security measures like searching fans for weapons, though both sides threatened violence.
In addition to fans and police, the manager of the stadium and the technician in charge of the lights have been charged. The trial is scheduled to resume May 5.
After the riot, Egypt imposed a two-year ban on Al-Masry, while this year's club season has been suspended. Port Said residents say their city has been stigmatized and boycotted by other Egyptians.