Calls to Execute Egypt's Military Ruler Echo on Cairo's Streets Video posted online is said to show protesters in Cairo on Thursday chanting for an end to military rule and the execution of Field Marshal Mohamed Hussein Tantawi, Egypt's de facto leader. As my colleague David Kirkpatrick reports from Cairo, Egyptians are mourning at least 73 people who were killed in a riot at a soccer stadium in the city of Port Said on Wednesday night. Protesters took to the streets of the Egyptian capital on Thursday, enraged by the lax security that allowed fans of the Port Said team, Al Masry, to enter the stadium armed with knives and then attack and kill supporters of the visiting team, Al Ahly from Cairo, as police officers looked on but failed to intervene. The fact that Ahly's most diehard supporters, known as the ultras, played an important role in battles with the police during last year's revolution led to widespread accusations that the security forces had permitted the deadly assault. After rallying late Wednesday at a Cairo train station, as the injured and the dead returned from Port Said, Ahly's ultras marched through Cairo on Thursday, chanting for an end to military rule. They were joined by their traditional enemies, the most diehard supporters of Cairo's rival Zamalek club. Bloggers posted video and photographs of the rival fans united in protest. Video of a protest march by fans of Cairo's two biggest soccer teams, shot by Tarek Shalaby, an activist blogger. According to an eyewitness account posted online, one of the team's star players, Mohammed Abu Trika, joined the fans in chanting for Field Marshal Mohamed Hussein Tantawi, who leads the military council that still rules Egypt, to be put to death. Modifying the popular revolutionary chant, "The People Demand the Fall of the Regime," the protesters shouted, "The People Demand the Execution of the Marshal." The night before, in an interview with Al Ahly's satellite channel from the stadium, Mr. Trika blamed the authorities for allowing Al Masry's fans to go on the rampage. It's like a war," he said. More chants against Marshal Tantawi can be heard in video posted online later in the day, as the ultras ringed Tahrir Square. Just days after appointing a new head of public relations for the military council, Marshal Tantawi responded to the crisis by rushing to the airport on Wednesday night to greet Ahly's players who were evacuated from Port Said on a military transport. Trailed by television cameras, he used the opportunity to suggest that the riots were not caused by a failure of the authorities to secure the stadium, but by "plotters" and "saboteurs." As this subtitled edit of video from Egyptian state television posted online by The Guardian shows, Marshal Tantawi seemed to employ the same strategy to deflect blame employed by former President Hosni Mubarak, hinting darkly that the chaos was the work of unnamed conspirators who were "planning to destabilize Egypt."