Egypt's Muslim Brotherhood is warning that a court ruling to dissolve the Islamist-led Parliament and let Hosni Mubarak's former prime minister run for president is a move toward reversing the gains of the revolution.

The group, which held the most seats in Parliament, says the decision will lead to more dangerous days than those under Mubarak's repressive regime.

Yesterday's statement says progress made since Mubarak was ousted last year was being "wiped out and overturned".

The Supreme Constitutional Court's decision leaves Egypt with no parliament and concentrates power even more firmly in the hands of the generals who took over from Mubarak.

Ahmed Shafiq, who was Mubarak's last prime minister, is set to face the Brotherhood's candidate Mohammed Morsi in a presidential run-off tomorrow and Sunday.

Activists who engineered Egypt's uprising have long accused the generals of trying to cling to power, explaining that after 60 years as the nation's single most dominant institution, the military would be reluctant to surrender its authority or leave its economic empire to civilian scrutiny.

One of the youth groups, the April 6 movement, which has thrown its support behind Mr Morsi, planned a march to Cairo's Tahrir Square dubbed "No to the military's soft coup".

But the Brotherhood did not call on its members to participate.

"We are going to the ballot boxes to say no to the losers, the killers, the criminals," Mr Morsi said during an interview on an Arabic satellite channel.

He also softened the rhetoric, saying he did not see the court ruling as a military coup against the revolution, despite a statement by a senior Brotherhood member earlier.