According to the Egyptian ministry of health, the death toll in clashes that broke out on Thursday between thousands of protesters in a number of Egyptian cities, angry over the Port Said massacre on Wednesday, and police forces has risen to 12 by midday Saturday.
Five protesters were killed in Cairo, and seven in Suez.
More than 1500 people have been injured.
73 football fans, mostly supporters of Ahly Ultras, were killed on Wednesday night after rival Masry fans stormed the pitch at the end of an Egyptian league game between Cairo's Ahly and Port Said's Masry.
The game witnessed tensions from the starting minute and lacklustre security presence according to many eyewitnesses.
Protesters are blaming the police for the deaths of Ultras fans, who have played a key role in the Egyptian revolution since 25 January, 2011, and many have been demanding the ruling military council step down.