Port Said residents rampaged through the streets in anger after 21 people were sentenced to death for their role in the deadly football riot that took place in February last year.
The defendants are all from Port Said, and their supporters attempted to storm the prison to free other defendants.
Wherever there is division in Egypt right now – death seems sure to follow. The greatest toll came amid gunfire and tear gas in Port Said.
Riots sparked by death sentences passed in connection with last year's deadly riot at the Port Said football stadium have killed 22 people.