The murder trial of Egyptian Ex-president Hosni Mubarak resumes after a three-month hiatus that saw the ousted strongman's fate eclipsed by deadly clashes and an Islamist election victory.

An ailing Mubarak, 83, risks the death sentence if he is found to have been complicit in the killings of some 850 people who died during protests that overthrew him in February.

Mubarak, who is in custody in a Cairo military hospital, also faces charges of corruption, together with his two sons Alaa and Gamal.

Ex-interior Minister Habib al-Adly and six security chiefs are also on trial for their role in quelling the protests.

The trial came to a halt when lawyers asked that presiding judge Ahmed Refaat be replaced, a request that was subsequently rejected on December 7.

More than 5,000 policemen will be deployed to secure the proceedings, the interior ministry said.

Mubarak's first hearing on August 3 was broadcast live on television, but Refaat soon ordered the cameras out.

The judge drew the ire of lawyers representing Mubarak's alleged victims after he issued a media gag order on testimony by high-profile witnesses, including the country's military ruler Field Marshal Hussein Tantawi.

In statements after his testimony, Tantawi said Mubarak had never ordered the shooting of protesters.

Mubarak is the first leader to be toppled in the so-called Arab Spring uprisings to appear before a court, AFP reported.