Security forces have arrested on Saturday 11 Muslim Brotherhood members in Port Said for allegedly assaulting military officers deployed in front of the governorate headquarters, and referred them to the military prosecution.

The defendants assaulted on Friday army forces securing the building after they attempted to disperse a demonstration in support of ousted president Mohamed Morsi, reported state news agency MENA.

The protesters reportedly possessed Molotov cocktails and fireworks, and chanted against the police and army.

In the deadliest clashes in Egypt between supporters of the ousted president and security forces in the past two months, 14 were killed nationwide and 258 Brotherhood supporters arrested on Friday.

In September, a Suez military court sentenced Brotherhood member Mohamed Mongey to ten years in prison on charges of inciting violence and vandalising military property in August.

Supporters of Morsi have been holding almost daily protests since his ouster in July amid a major security crackdown on members, leaders and sympathisers of the Islamist group which has seen hundreds killed and thousands arrested.

The demonstrators are challenging a recent decision by the cabinet to designate the Muslim Brotherhood a terrorist group after accusing it of sponsoring terrorist attacks targeting security forces. The Brotherhood has denied involvment in such attacks.

Article 204 of the newly-amended constitution, to be put to national referendum 14 and 15 January, allows military trials for civilians if they attack buildings, territories and personnel affiliated with the military.