Hundreds of thousands of Egyptians rallied Friday in Cairo’s Tahrir square with Islamists in the forefront to protest against what they say are attempts by the country’s military rulers to designate themselves as the guardians of a new Egypt. It was one of the largest rallied in Egypt in recent months.

Most rallies in Tahrir have been led by liberal- or left-leaning groups. But Friday’s rally was dominated by the country’s most organized political group, the Muslim Brotherhood, which has rarely come out in full force since the protests that forced President Hosni Mubarak to step down in February.

The Brotherhood had until recently avoided confrontation with the ruling Supreme Council of the Armed Forces, but now warns of escalating its protest campaign if plans to give permanent political powers to the military are not scrapped.