[Update, 12:52 p.m. ET] Two protesters have been killed Wednesday in clashes between supporters
and opponents of the government of Egyptian President Mohamed Morsy, according to a spokesman for the Egyptian Ministry of Health, Dr. Mohammed Sultan.

[Update, 12:49 p.m. ET] Thousands of supporters of Egyptian President Mohamed Morsy clashed with anti-government protesters outside the presidential palace in Cairo Wednesday, driving them from the grounds where they had set up camp.

Morsy opponents pushed back, charging Morsy supporters with Molotov cocktails. Both sides exchanged rocks and fireworks before the anti-Morsy protesters were pushed back again.

It was unclear if anyone was hurt in the latest exchange. Earlier, the Ministry of Health said four people were injured in the scuffles.

Q & A:What's driving Egypt unrest?

[Initial post, 7:31 a.m. ET] Egypt's capital boiled Wednesday as protesters supporting and opposing President Mohamed Morsy geared up for demonstrations.

People angered by Morsy continued a sit-in in Cairo's Tahrir Square after a night marked by violent clashes outside the presidential palace.

Police fired tear gas Tuesday night after protesters broke through barbed wire around the palace building and hurled chairs and rocks at retreating officers. Opposition forces later were calling for a march toward the palace.

After the initial clashes, police withdrew behind fences and the large demonstration was peaceful for several hours. A few dozen protesters and a scattering of tents remained outside the Itihadiya palace Wednesday.

The Muslim Brotherhood, the pro-Morsy Islamist movement, called for a rally in front of the presidential palace Wednesday afternoon in support of the country's leader and against his foes in the street.