Clashes in the Egyptian capital erupted on Friday between supporters of the Muslim Brotherhood and protestors that stand against the leading party.

Four buses belonging to the brotherhood were torched and ransacked in Cairo, Al Arabiya's correspondant reported.

The violence in they city has injured at least 40 people up till now, police have fired tear gas at protestors.

The toll is likely to rise and  hostilities continue.
Earlier today, a group of men stormed a Muslim Brotherhood office in the Egyptian capital on Friday, ransacking it and assaulting some of the group's members, the movement's spokesman told AFP.

The attack on the office came as hundreds of protesters clashed with police and Islamists outside their main headquarters in another Cairo neighborhood.

The two sides threw stones at each other near the building. Police who had been deployed outside the headquarters, have not yet intervened, an AFP correspondent said.

As the clashes continued, live television showed hundreds of protesters carrying anti-Brotherhood banners and making their way up to the hilly Mokattam neighborhood where the Brotherhood headquarters are situated.

Opposition activists had called for the protest a week after they clashed with the Islamists near the headquarters. The Brotherhood on Thursday vowed it would protect its headquarters and bused in hundreds of supporters.

The Brotherhood has seen about 30 of its offices across the country attacked in widespread protests against President Mohamed Mursi, the Islamists' successful candidate in last June's election.

The Brotherhood, well-organized despite decades of persecution under former strongman Hosni Mubarak and his predecessors, was the main winner of parliamentary and senate elections last year.

But its critics accuse it and Mursi of mirroring the tactics used by Mubarak against the opposition.