Egypt's public prosecutor on Thursday ordered the detention of Muslim Brotherhood chief for another 15 days pending an investigation into fresh allegations, judicial sources said.
The new charges against Brotherhood's Supreme Guide Mohamed Badie include inciting murder and torture of protesters at a main Cairo protest camp set up by supporters of deposed Islamist president Mohamed Morsi.
The preventative detention of the Brotherhood's Supreme Guide would come into effect when he serves two other temporary detention orders on similar charges.
Badie faces an array of charges faces, including instigating murder, attempted murder and torturing anti-Morsi protesters in December 2012. He is also accused of inciting violence, damaging public and private property, and attacks on security and army personnel outside a Cairo barracks. At least 51 were killed when the Egyptian army opened fire on Morsi supporters outside the Republican Guard barracks in northeast Cairo in July.
Badie and his two deputies are due to stand trial on 25 August.
Mohamed Badie, 70, was arrested Tuesday at an apartment in Nasr City in northeast Cairo.
Dozens of the Islamist movement upper echelons have been rounded up since the overthrow of president Morsi.
The White House criticised the move, saying it ran contrary to the military’s commitments to foster an "inclusive political process."