Alaa and Gamal Mubarak, with seven other men, are accused of violating stock market and central bank rules to make unlawful profits through dealing in shares of Al Watany Bank of Egypt.
ex-Egypt dictator Hosni Mubarak's health deteriorates
They deny any wrongdoing.
Three other men including Yasser El Mallawany and Hassan Heikal, current and former board members respectively at Egyptian investment bank EFG-Hermes, were also arrested, a judicial source said.
Egypt's Hosni Mubarak walks free after six years
All those accused in the case, which began in 2012, had been released on bail and barred from travel.
Mubarak’s eldest son, Alaa, is a businessman. Gamal, a former banker, was widely viewed as being groomed for Egypt’s top job until Mubarak was toppled in February 2011.
The pair had been free since 2015.
The court's next session is set for Oct. 20.
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