Mubarak and his two sons, Alaa and Gamal, who are on trial for corruption, appeared at the court session today.
Mubarak is charged with both corruption and responsibility for the deaths of some 850 protesters during the early days of the 2011 revolt.
The former leader was convicted in 2012 of the charges, but an appeals court granted a retrial.
Mubarak's democratically elected successor, Mohammed Morsi, was overthrown by the military on Wednesday and replaced with an interim president as part of what the army says is a roadmap to new elections.