Several revolutionary groups have announced they will hold demonstrations on Friday against the verdict in the trial of ousted president Hosni Mubarak.

The groups include April 6 Youth Movement, Revolutionary Socialists, Youth for Justice and Freedom, Constitution Party and Strong Egypt Party.

They dubbed the demonstration: 'The Martyr's Right... A popular trial for the ousted president and his regime'.

"The corrupt and tyrannical regime that Egyptians revolted against is back, but the martyrs are not," they said on a Facebook event launched to call for the demonstration.

In a separate statement on Wednesday, the April 6 Youth Movement called for unity among political factions, saying it was the strength of such unity the originally toppled Mubarak in 2011.

The final venue for the protest is still unclear. However, the Facebook event created says it will take place at the Cairo Opera, west of Tahrir Square.

A Cairo court on Saturday dropped charges against Mubarak over his complicity in the killing of protesters during the January 2011 uprising, which ended his 30-year reign.

The court cleared interior minister Habib El-Adly and six of his top aides of charges in the same case.

Mubarak was also cleared of other corruption charges.

While Mubarak's supporters hailed the verdict, opponents voiced their objection. Almost three thousand people protested against the ruling near Tahrir Square on Saturday. Police later dispersed the crowds, leaving two dead.

Students also held demonstrations against the verdict on several campuses around the country this week, including Cairo and Ain Shams.

The banned Muslim Brotherhood also vowed to protest against it. 

The Brotherhood has called on "fellow revolutionaries" to collaborate to protest the verdict. The secular groups calling for Friday's protests, including the April 6, have denied that any collaboration is possible.