The website said that over 3,000 protesters broke into the Brotherhood's main headquarters and set fire to its contents.
Protesters also attacked the Brotherhood's headquarters and buildings in other governorates on Wednesday evening following the clashes between supporters and opponents of President Mohamed Morsi.
In Ismailia city, protesters stormed the MB headquarters with stones and Molotov cocktails, while in Suez they broke into the headquarters of the MB's Freedom and Justice Party (FJP) and set its assets ablaze.