(Ahlul Bayt News Agency) - Beltagi, who had issued defiant video recordings in hiding, was the latest Brotherhood leader detained in a wide-ranging crackdown on the Muslim Brotherhood seniors.
A former member of parliament, he became one of the most vociferous opponents of the popularly backed military coup that toppled Islamist president Mohammad Mursi on July 3.
He was arrested in a village near Cairo, state television reported.
Police had already arrested the Brotherhood's supreme guide Mohamed Badie and much of the senior leadership.
Badie and his deputies are standing trial on charges of involvement in the murder of protesters who stormed the Brotherhood's headquarters on June 30.
After arresting much of the movement's leadership, the police have begun rounding up mid-level operatives around the country.
The interior ministry also warned Thursday that live ammunition will be used on protesters who attack public institutions.
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