Lawyers Mohammed Abdel-Aziz and Gamal Eid said the yesterday's arrests were made in raids staged before dawn or shortly before or after sunset, when Muslims break their dusk-to-dawn fast during the holy month of Ramadan with a meal known as iftar.
The lawyers put the number of arrests until nightfall Thursday at between 32 and 40 and said those detained were mostly linked to secular democratic parties. The arrests came amid calls on social media for protests against the agreement to be held Friday at Cairo's Tahrir square, epicenter of a 2011 popular uprising that toppled the regime of longtime ruler Hosni Mubarak.
Still, the April 2016 protests were the largest in Egypt since Abdel-Fattah el-Sissi, a general-turned-president, took office in 2014, a year after he led the ouster of an Islamist president.
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Meanwhile, eight people, including three journalists, who were detained during a small protest Tuesday against the islands transfer were released Thursday on bail, said the lawyers. They faced charges of disrupting public services and security and protesting without a permit.
Yesterday's arrests came a day after a senior constitutional panel concluded that two courts which ruled to annul the transfer of the islands to Saudi Arabia had acted within their jurisdiction, defying parliament, which on Wednesday overwhelmingly backed the deal.
The outcome of Wednesday's vote was a foregone conclusion since the legislature is packed by el-Sissi supporters, whose government insists the islands belong to Saudi Arabia.
The panel's report is meant as a guideline for the Supreme Constitutional Court, which is due to start hearings July 30 on whether the courts had acted within their jurisdiction when they ruled in June 2016 and in January this year to annul the deal. The panel's findings are not binding, but are rarely ignored.