Alaa Hamza, a member of the Muslim Brotherhood accused of capturing and torturing opposition protesters, was released on bail of LE10,000 on Wednesday, Al-Ahram Arabic news website reported.
Hamza had been detained for 24 hours while prosecutors decided whether to bring charges against him.
He was summoned by prosecutors in mid-April to answer questions about accusations that he took part in the mistreatment of opposition protesters near the presidential palace in December 2012.
Videos posted online after the violence – which resulted in several deaths – showed protesters being tied up, interrogated and physically assaulted by bearded men near the presidential palace in Heliopolis.
Hamza appeared in some of these videos, interrogating and insulting captured protesters.
President Mohamed Morsi was a long-term member of the Muslim Brotherhood until he resigned when he became president.
