Commentators on Egyptian TV have welcomed the arrest of the Muslim Brotherhood's general guide, Mohammed Badie.
Presenters congratulated viewers on the development, calling it "joyful news", and one expert argued that it had dealt a heavy blow to the Islamist group.
Muslim Brotherhood supporters, however, remained defiant. " We are all the general guide," said one tweet.
News of Mr Badie's arrest broke in an urgent caption on state-owned Channel One. The network's security correspondent congratulated Egyptians on the development, hailing security agencies' efforts. An image of Mr Badie inside a police vehicle was shown.