Police found "flammable liquid, knives and arms to be used against the June 30 protests," the official said.
The Muslim Brotherhood has always claimed that it had nothing to do with the violent attacks on Anti-Morsi protesters during Morsi's reigns, but the latest finds at its HQ draw an entirely different picture.
Egypt's prosecution ordered the closure of the Cairo headquarters of the Muslim Brotherhood's Freedom and Justice Party after police found weapons inside it on Monday, a security official said.
Police found "flammable liquid, knives and arms to be used against the June 30 protests," the official said, in reference to demonstrations that saw millions take to the streets to demand the resignation of Islamist president Mohamed Morsi.
The Muslim Brotherhood, which has led demonstrations against the overthrow of Morsi last Wednesday, said its supporters were "massacred" when police and troops fired on them during dawn prayers outside an elite army headquarters in Cairo.
The military blamed "terrorists" while witnesses, including Brotherhood supporters at the scene, said that the armed forces fired only tear gas and warning shots and that "thugs" in civilian clothes had carried out the deadly shooting.
Any bets on whether the Brotherhood's own thugs carried out attacks on its own people in order to intensify the protests?