At least 15 people were injured on Sunday when supporters of Egypt’s ousted president Mohamed Morsy went on a shooting rampage in a coastal city, the state news agency MENA reported, citing medical and security officials.

The assailants randomly fired on passers-by, using live bullets and birdshot, in the Suez Canal city of Port Said, the report said.

The attack came a day after dozens of Mr. Morsy’s supporters were killed in clashes with security forces in Cairo in a protest against the Islamist president’s overthrow by the army this month.

Mr. Morsy’s Muslim Brotherhood said at least 200 people were killed in what it called a “massacre” by the army and police against its followers while the government put the toll at 72.

One of the dead was a brotherhood supporter from Port Said, where angry mourners attacked a local church, stores and cars in protest late Saturday, MENA said.

According to government figures, nearly 200 people have been killed in violence in Egypt since Mr. Morsy’s overthrow July 3.

The army and its supporters accuse the brotherhood and Mr. Morsy of inciting violence in Egypt. The ousted leader is facing charges of conspiring with Hamas to perpetrate “hostile acts” during the uprising against his predecessor Hosni Mubarak in 2011.

He is being detained by the military in an undisclosed location.

The brotherhood and its Islamist allies have vowed to continue protesting until Mr. Morsy is reinstated.

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