The Egyptian prosecution released Hisham Geneina and ordered the detention of three other people on Sunday, pending national security investigations into an alleged assault on the former head of the state’s Central Auditing Organization.
On Saturday, the interior ministry released a statement on the incident saying it was a street fight involving Geneina that took place after his car hit the vehicle of a coffee shop owner in New Cairo's First Settlement area.
The former top auditor was riding in the car with his wife, daughter and a guard, and tried to flee the scene of the accident, the ministry said, when two other people stopped them until the police had been called.
"Geneina was injured, and has several abrasions on his hands and feet," the statement said.
"Three people, the owner of the coffee shop, an unemployed man, and a restaurant owner were found injured with leg fractures and scalp wounds, and were treated at New Cairo Hospital," it added.
"The police seized a piece of iron that was used as a weapon by Geneina's guard."
Other people involved in the incident also accused Geneina's wife and daughter of assault.
''Upon interrogating the parties involved, they all denied the claims. The police have referred the incident to the prosecution for investigation," said the statement.
Geneina's family and his lawyer denied the incident was a street fight, describing it as a “failed kidnapping and assassination attempt” on Geneina, who was a leading member of the halted presidential campaign of former military chief-of-staff Lieutenant General Sami Anan.
Geneina sparked controversy by saying in December 2015 that government corruption had cost the country billions of dollars.
The former top auditor has been referred to criminal court for his remarks, while a misdemeanour court endorsed in December a first-degree one-year suspended prison sentence for him for "disseminating false news".