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Government officials say the decision could be a prelude to a major crackdown on Mohamed Mursi's supporters or militants who have stepped up attacks against security forces in the Sinai Peninsula, Ahram Online reported.
Mansour's decree was published in the government's official gazette Sunday.
The death toll from Saturday clashes between Mursi supporters and security forces has risen to at least 80, according to the health ministry. Protesters calling for his reinstatement have vowed to continue a massive sit-in.
The officials spoke on condition of anonymity because they were not authorized to speak to the media.
By Fars News Agency
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