Morsi, already under detention by the army after he was deposed on July 3, will be quizzed on whether he collaborated with Hamas in attacks on police stations and prison breaks in early 2011 during the revolt against former president Hosni Mubarak, MENA news agency reported.
This is the first official word on 61-year-old Morsi's status after his ouster by the army.
The judicial detention was initially ordered for 15 days.
The alleged crimes are being investigated by a Cairo court that is tasked to determine how inmates broke out of a prison late January 2011, after accusations that Morsi's Islamist group sought the help of the Hamas rulers of Gaza.
Many Islamist leaders, including Morsi escaped from the prison in 2011.
The international community had called on the Egyptian state to legalise the position of the former president.
Leading Brotherhood member Essam El-Erian said that the decision to detain Morsi showed the true 'fascist military regime' currently in Egypt.
'Announcing a decision to detain a legitimate president who has immunity, who should not stand a trial except under specific constitutional procedures, under very suspicious timing in the absence of the simplest concepts of the state of law as well in the absence of his lawyer, shows the nature of the current struggling fascist military regime,' said El-Erian on his official Facebook page earlier today.
'The answer to this will be peaceful million man protests in the squares. Our strength is in our peacefulness and our unity as a people against fascism, oppression and corruption,' said El-Erian.
'This is the fate of those who participated in January revolution at the hands of Mubarak's men who returned back to get revenge on the people,' he said.
Hamas also criticised the decision to detain Morsi for questioning over suspected collaboration with it.
Army chief Gen Abdel Fattah al-Sisi has called on people to take to the streets today to give the military a mandate to confront violence and 'terrorism'.
Supporters of Morsi are also due to protest.
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