Egyptian courts have held hearings in separate cases against deposed former President Hosni Mubarak and leaders of the Muslim Brotherhood, his longtime political foe.
In both of Sunday's hearings, judges adjourned the cases citing procedural reasons.
Mr. Mubarak appeared in one Cairo court looking relaxed, three days after authorities released the 85-year-old from prison to house arrest at a military hospital near the capital.
The longtime former president, ousted in a 2011 popular uprising is on trial for complicity in the killings of hundreds of protesters in the uprising. He was convicted and sentenced to life in prison last year, but a higher court ordered a retrial on appeal.
The judge postponed the proceedings to September 14.
In the day's other hearing, the judge quickly adjourned the case against six Muslim Brotherhood figures including top leader Mohamed Badie and two of his deputies, after none of them appeared in court. Authorities declined to transport Badie and his aides to the court citing security risks.
The defendants face charges in connection with the killings of several anti-Brotherhood activists in a July 30 protest near the Islamist movement's Cairo headquarters. The Brotherhood denies the charges and says they are politically-motivated.
The protests prompted the military to oust Brotherhood-backed president Mohamed Morsi on July 3 and replace him with a civilian-led interim government.
Egyptian media highlighted the symbolism of simultaneous proceedings against Mr. Mubarak and the Brotherhood, which won a presidential election to succeed him. One newspaper referred to the hearings as the "trials of two regimes."