With two more people killed since Wednesday's stadium tragedy in Port Said, renewed violence in Egypt has highlighted the ongoing struggle for power there. German editorialists say the violence at the football match was just the latest manifestation of tensions between protesters and the powerful military.

Violence in Egypt spread overnight with protests in Cairo and other cities. Two protesters died after being shot by police in riots sparked in Suez, located around 140 kilometers (87 miles) south of the capital. Hospital workers claim at least 30 people were injured.

Witnesses reported that police initially tried to break up protesters, who had attempted to occupy the headquarters of the local security force. Uniformed officers first fired tear gas, and later live ammunition at protesters, they said. But security officials told news agencies that the police had not opened fire and alleged the protesters had been armed.

Violent protests also erupted in Cairo following the deadly riot at Port Said stadium on Wednesday that resulted in the deaths of 74 soccer fans. Critics have accused security forces of failing to act, with some even claiming it was a planned action.

Late Thursday night and into Friday morning, thousands of protesters clashed with police in the capital city's famous Tahrir Square. The crowds threw rocks at security forces and attempted to reach the Interior Ministry, chanting for the resignation of Hussein Tantawi, the head of the country's military leadership. Others called for his execution.