Omar Al-Zuhair, an advisor to Morsi-era Prime Minister Hesham Qandil, has been released on bail pending investigation into charges of retaining cabinet documents after ending his service.
The police has presented the cabinet documents it confiscated from his house to the public prosecution, which ordered the formation of a special committee to dissect the stolen papers.
Zuhair, who ended his service last year, was arrested on Friday, alongside 13 other Muslim Brotherhood members, and detained in the Sayeda Zeinab police station overnight.
The arrests are part of a heavy crackdown on supporters of ousted President Mohamed Morsi and the Muslim Brotherhood. Senior officials of the organisation, including Morsi and Supreme Guide Mohamed Badei, are currently standing trial.