Earlier this week , an Egyptian court also cleared Mubarak of charges that he and his sons stole public money for presidential palaces.
In other developments Wednesday, Egyptian authorities arrested a Muslim Brotherhood spokesman and a radical preacher with ties to the group.
Spokesman Mourad Ali was taken into custody at the Cairo airport, while cleric Safwat Hegazy was arrested near the Libyan border. Officials said both were trying to flee the country.
Egypt's military-backed interim government has been cracking down on the Islamist Brotherhood movement since July 3, when it removed Brotherhood-backed president Mohamed Morsi from office and placed him under arrest.
Egyptian authorities say at least 1,000 people have been killed in political violence since then. The Brotherhood says the toll is much higher.