Three people were killed in the ongoing riots here in the Egyptian capital, the health ministry said Wednesday.
A witness said one young man was shot dead by a group of people in civilian clothes armed with knives and shotguns.
Earlier, Egyptian President Mohammed Morsi declared a state of emergency in three cities along the Suez Canal, where violent riots killed dozens of people.
Dozens have died and hundreds have been injured in clashes between police and soccer fans in Egyptian cities of Port Said, Ismailia and Suez.
Four more people were killed and more than 400 others were injured after thousands of mourners attended a mass funeral in Port Said.
The violence erupted last week, after a court handed down death sentences to all 21 defendants in a trial into the so-called "Port Said tragedy".
It was Egypt's worst-ever football fan clash and stampede that left at least 72 people dead and another 254 injured last February.