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Human rights activists in Egypt say that a blogger and journalist who played a significant role in the 2011 uprising against former President Hosni Mubarak has been arrested.
A fellow activist said that Esraa Abdel Fattah was picked up on Saturday night by police officers and driven away. Her whereabouts are currently unknown.
Another activist has tweeted that Ms Fattah appeared before state prosecutors on Sunday and had said that she was "badly beaten and tortured" :
Ms Fattah was co- founder of a youth movement that played a big part in mobilising the millions of protesters who forced former President Mubarak to stand down as president.
In the past three weeks, rights groups say that about 3,000 people, including activists, lawyers and academics, have been detained in a major wave of arrests following rare protests against President Abdel Fattah el-Sisi.
BBC World Service
A row between Egypt and Ethiopia over the damming of the River Nile has escalated after recent talks between the two countries failed to make any progress.
In parliament Egypt's Foreign Minister Sameh Shoukry accused Ethiopia of ignoring an agreement and going ahead to fill up the Renaissance Dam, which he described as an unacceptable move that would affect the stability of the region.
Ethiopia hopes the $4bn (£3.3bn) dam will be fully operational by 2022 and will help the country become the continent's biggest electricity exporter.
Egypt has long been opposed to the project as it relies on the River Nile for around 90% of its fresh water.
The speaker of the Egyptian parliament has sparked anger on social media after using Adolf Hitler as an example to justify extravagant spending by President Abdelfatah al-Sisi, praising the "achievements" of Germany's Nazi leader.
Critics accuse President Sisi of spending large amounts of money on castles, luxurious villas and a new capital city, while many Egyptians suffer from growing poverty.
During a speech to parliament in which he was trying to justify Mr Sisi's spending, Ali Adelal reportedly said: "Hitler also made mistakes when he expanded East and West but he built fantastic infrastructure for his country which was the basis of the development in today’s Germany".
He praised "the infrastructure that Germany has constructed, which is a model for the whole world".
However, according to Egypt Today, he later clarified: "No-one can praise Hitler for his actions against humanity. No country can develop without a strong infrastructure and this is the only thing I was referring to in my statements."
"Hitler committed a lot of crimes against the world and I cannot praise him," he said.
Sudan summoned the Egyptian ambassador over the arrest of a Sudanese student in Cairo.
Waleed Abdelrahman is said to have taken part in anti-government protests in Egypt, but his family has denied the allegations.
After the meeting the envoy said Sudanese diplomats would be able to meet him on Sunday.
Hundreds of people demonstrated outside the foreign ministry in Sudan's capital, Khartoum, to demand the release of the student.
The protests against President Abdel Fattah el-Sisi, the first in a long time, erupted last week.
BBC World Service
Security has been tightened in the Egyptian capital, Cairo, and in other cities ahead of possible anti-government protests.
Tahrir Square, where protesters gathered in January 2011, has been closed and three neighbouring metro stations have been shut down.
The protests have been called for by an exiled opponent of the government.
President Abdul Fattah al-Sisi has arrived back in Egypt after attending the UN General Assembly in New York.
He told supporters at Cairo airport there was no need for concern.
Rare protests took place a week ago, leading to the arrest of nearly 2,000 people.
Pro-government protests are also due to take place at Rab'a Square where nearly a thousand pro-Muslim Brotherhood protesters were killed in 2013.