It's a test of whether Morsi's allies can keep up the pressure on the government, despite the arrest of much of their senior leadership.
Protesters chanted against the military and held up posters of Morsi on smaller streets and outside neighborhood mosques. They avoided major roads and squares where military and security forces had deployed in strength ahead of today's rallies.
At one rally outside a mosque in the city of Giza, a Morsi supporter said he wasn't deterred by the arrests and by violence against demonstrators. He said he will keep protesting until, in his words, "our legitimate president comes back."
The demonstrations came a day after deposed autocrat Hosni Mubarak was released from prison and placed under house arrest in a military hospital in southern Cairo, a move that added to tensions in Egypt.