Reports from Egypt say protesters have marched to the offices of the secret police in Cairo and other cities demanding that the organisation be dismantled.
Abolishing the secret police has been one of the main demands of the protest movement that ousted president Hosni Mubarak.
The protests followed rumours that officials were destroying documents that could be used in court to prove human rights abuses.
Earlier, former interior minister Habib Al-Adly, who was in charge of the secret services, appeared in court accused of money-laundering and corruption.
There was heavy security around the criminal court in the suburb of Tagammu Khames, with tanks positioned at the entrance, the BBC reports.
Dozens of people had gathered outside to demand the death penalty.
Mr Al-Adly denied the charges against him and the hearing was adjourned until 2 April to allow the defence more time to study court papers.
He was arrested in mid-February, days after Mr Mubarak resigned.