A teenager was killed and two other people injured in clashes in Alexandria following pro-Muslim Brotherhood protests on Friday, Al-Ahram Arabic website reported.
Ayman Abdel-Moneim, the health ministry's undersecretary in Alexandria, said Sondos Reda Abo Bakr, 15, died after sustaining a birdshot wound.
She was transferred to Kom El-Dekka morgue while those injured were treated and released from hospital.
Muslim Brotherhood loyalists staged anti-government marches in several parts of Alexandria on Friday and police dispersed the protests. Police also arrested eight people in Al-Asafra area, according to Al-Ahram.
On Thursday evening, Islamists also staged protests in central Alexandria.
In Cairo, clashes also broke out on Friday between police and Islamist protesters in the Faisal area of Giza, Greater Cairo.
Egypt introduced a law in November 2013 that banned unauthorised demonstrations and instituted stiff penalties for violators. It was deemed too harsh by many local and international rights groups. Hundreds have been arrested under its provisions.
Supporters of the Muslim Brotherhood, which was banned by the government and declared a terrorist organisation, have staged regular protests since Morsi's 2013 ouster.
The group has also demonstrated against the detention of its members, especially on university campuses.