The group was protesting Egypt's emergency law and demanding constitutional reforms in the country.
The controversial law, which gives police wide powers of arrest, suspends constitutional rights and curbs non-governmental political activity. It was extended in May by a majority of MPs in the 454-member parliament.
Abu Duma had been sentenced by the court of first instance to six months in prison. The appeals court, which did not give a reason for the reduction, issued instructions that he should start his jail term immediately.
Anti-government protests, usually organised by small secular opposition groups, have gained momentum since former UN nuclear watchdog chief Mohammed ElBaradei returned to the country in February to press for reforms.
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The controversial law, which gives police wide powers of arrest, suspends constitutional rights and curbs non-governmental political activity. It was extended in May by a majority of MPs in the 454-member parliament.
Abu Duma had been sentenced by the court of first instance to six months in prison. The appeals court, which did not give a reason for the reduction, issued instructions that he should start his jail term immediately.
Anti-government protests, usually organised by small secular opposition groups, have gained momentum since former UN nuclear watchdog chief Mohammed ElBaradei returned to the country in February to press for reforms.
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