A number of female political activists have submitted a report to the prosecutor-general accusing police of abduction, assault, sexual harassment and dumping them in the desert.
Mona Seif, Nazli Hussein, Rasha Azab, Mai Saad, Salma Said and Aida El-Kashaf were among dozens of activists arrested at a No to Military Trials of Civilians protest in Cairo on Tuesday.
They accuse police of assaulting and sexually harassing them during their arrest and detention. The women were later dumped on the Cairo-Upper Egypt desert highway in the middle of the night.
The interior ministry has denied the allegations.
The six activists also handed themselves over to the prosecutior-general, saying they were the organisers of Tuesday's protest, which broke Egypt's new protest law because it was not granted permission before it took place.
The prosecutor-general has already ordered the arrest of activist Alaa Abdel-Fattah and April 6 Youth Movement founder Ahmed Maher for inciting the protest.
Twenty-four people arrested at Tuesday's protest are still being detained.