Three leaders of Egypt's Muslim Brotherhood and the movement's former arch-foe Hosni Mubarak faced separate trials today on similar charges of involvement in the killing of protesters.
With Egypt now under an army-installed government after last month's overthrow of Islamist President Mohamed Mursi, local media seized on the symbolism of scheduling both sessions on the same day. "Trial of two regimes," headlined al-Shorouk daily.
In the end, Mohamed Badie, the Brotherhood's "General Guide", and his deputies did not appear at the opening of their trial for security reasons, a judicial source said.
Citing their absence, the judge adjourned the proceedings until 29 October.
The case against Mr Badie, Mr Khairat al-Shater and Mr Rashad Bayoumy relates to unrest before the army removed Mr Mursi on 3 July.
Mr Mursi has been detained in an undisclosed location since then.
More than 1,000 people, including about 100 soldiers and police, have died in violence across Egypt since Mr Mursi's fall, making it the bloodiest civil unrest in the republic's 60-year history.
Muslim Brotherhood supporters say the toll is much higher.
Mr Mubarak, who left prison on Thursday after judges ordered his release, appeared in a courtroom cage in a wheelchair, wearing sunglasses and dressed in white, along with his jailed sons Gamal and Alaa and former interior minister Habib al-Adly.
After a hearing that lasted about three hours, the judge set the next session for 14 September, pending further investigation.
The former president was sentenced to life in prison last year for complicity in the killing of protesters during the 2011 revolt against him, but an appeals court ordered a retrial.
A helicopter flew Mr Mubarak to the court in the Police Academy on the eastern outskirts of Cairo from a military hospital where he was placed under house arrest after his release from jail.
The government used a state of emergency it declared earlier this month to place Mubarak under house arrest, apparently to forestall any public anger if he had simply walked free.