At least 30 people have been killed during violent protests at Port Said in Egypt, following the court decision to sentence 21 people to death in connection to last year’s football riots.

Supporters of the defendants attacked police stations and two police officers were shot dead near the city’s prison. Hundreds of people have been wounded in the riots.

The army has now been brought in to restore stability in the city.

Last February, 74 people were killed during a football match at Port Said stadium after clashes broke out between fans of Al-Masry and Al-Ahly clubs.

The latest outbreak of violence in Port Said follows unrest in Cairo, which took place on the second anniversary of the uprising that overthrew the previous president, Hosni Mubarak.

The street protests criticised current Islamist president Mohammed Mursi, condemning him for being autocratic, introducing a constitution that fails to protect freedom of expression and worsening Egypt’s economy.