Cairo: Protesters on Friday made their way to Cairo's Tahrir Square for what they hope will be a mass rally to "reclaim the revolution" amid anger over the military rulers' handling of the transition.

Hundreds flocked to Tahrir Square -- the epicenter of protests that toppled President Hosni Mubarak in February -- to demand an end to military trials of civilians, cleansing institutions of former regime remnants, amendment of a recently published electoral law and social justice.

The powerful Muslim Brotherhood said in a statement on Wednesday it had decided to stay away from the demonstration.

On Thursday, the Supreme Council of the Armed Forces -- which took power when Mubarak was ousted -- warned against any threat to democracy and national security and "those who seek to impede the democratic transformation that began with the call for parliamentary elections."

Two days earlier the military laid out the timetable for the first post-Mubarak elections which will start on November 28 and take four months. Presidential elections are expected to be set next year.

Several groups, including the Muslim Brotherhood, have objected to Article Five of the electoral law, which bans political parties from running in a third of the seats in the Parliament, which are reserved for independent candidates.

They fear the measure would help return old regime figures to parliament.

Under Mubarak, independents affiliated with his party used patronage or pressure to garner votes, something that the proportional list system would help avoid, the parties say.

"Those who have called for the Friday (protest) bear the responsibility to organize and secure and protect all private and public property," SCAF said.

"Any encroachment on army units or camps or important establishments will be considered a threat to Egyptian national security and will be dealt with the utmost firmness," it added.

But in a statement published on Facebook, the pro-democracy April 6 movement objected to the military's depiction of activists as troublemakers.

Thousands of protesters have gathered in Tahrir Square on an almost weekly basis to rally for speedy reforms.