Egypt Muslim Brotherhood leader Mohammed Badie held

The most senior leader in Egypt's Muslim Brotherhood, Mohammed Badie, has been arrested in Cairo.

Mr Badie, who was wanted over alleged incitement to violence and murder, has been temporarily replaced as "general guide" by his deputy, Mahmoud Ezzat.

In another development, Egypt's ex-vice president Mohamed ElBaradei is to face trial on charges of breaching national trust after resigning last week.

Almost 900 people have been killed in the country since Wednesday.

Among them are 36 Islamist protesters who died in a prison van in Cairo on Sunday.

The UN's human rights agency OHCHR has said the deaths of the detainees are "deeply disturbing and need to be fully investigated".

Spokeswoman Liz Throssell said all those detained must be "treated humanely" and according to international law, and appealed to Egypt to allow UN human rights officers in to assess the situation.

Egypt is under a state of emergency as the military-backed interim leaders crack down on Islamists opposed to the army's ousting of Mohammed Morsi.

European Union foreign ministers will meet on Wednesday to decide whether to cut some of the billions of euros in aid pledged to Egypt.

Hundreds of members of the Muslim Brotherhood - the movement from which Mr Morsi comes - have been detained, including Mr Badie's deputy, Khairat al-Shatir, who was arrested in the days following Mr Morsi's overthrow on 3 July.

Mr Badie, 70, had initially been a prominent figure at the Brotherhood's protest camps in Cairo, but went into hiding as the military-backed interim government increased its efforts to shut down the protests.

He is facing charges of inciting violence and murder over the deaths of eight anti-Brotherhood protesters outside the movement's headquarters in Cairo last June.

Officials said he had been detained in a flat in Nasr City in north-east Cairo, near the site of one of the protest camps bloodily broken up by security forces last week.

The interior ministry released footage of him apparently taken shortly after his arrest.

The Brotherhood's political wing, the Freedom and Justice Party, said Mahmoud Ezzat - currently the movement's deputy leader and who is also subject to an arrest warrant - would temporarily take over from Mr Badie as "supreme guide".