CAIRO -- Egyptian riot police fired volleys of tear gas and locked down Cairo's Tahrir Square Friday as clashes broke out in a rare push by Islamist supporters of the ousted president for control of the iconic square, leaving at least four dead.
With lines of armored vehicles and barbed wire, troops sealed off the square and diverted traffic after the Muslim Brotherhood, the group from which ousted president Mohammed Morsi hails, called on its supporters to march there.
Thousands of Morsi's supporters followed suit from different parts in the city, chanting "El-Sissi is the enemy of God" and "Down with the murderer!"
Those were references to Defense Minister Abdel-Fatah el-Sissi, who forced Morsi from power on July 3 after millions took to the streets demanding the Islamist leader step down.
In its statements, the Muslim Brotherhood called Tahrir Square "the capital of the revolution." It is the birthplace of the 2011 uprising that forced longtime president Hosni Mubarak from power and led to Morsi's short-lived tenure.
Since Morsi's ouster, nearly 2,000 Muslim Brotherhood members have been arrested, its top leaders referred to courts over charges of inciting murder and violence, and hundreds of Morsi supporters have been killed. Morsi himself has been detained incommunicado.
On Friday, authorities arrested Ahmed Soubaei, a spokesman for the Freedom and Justice party, the Brotherhood's political arm, after raiding his house, the group said on its official website.
In a reflection of the chaos, the spokesman of the liberal al-Dustour party Khaled Dawoud came under attack when he drove past a group of pro-Morsi supporters marching on a street near Tahrir Square. The assailants dragged him from his car, beat him and stabbed him in the arm, Dawoud was quoted as telling the state-run Al-Ahram news site.
His party was founded by leading pro-democracy figure Mohamed ElBaradei, who acted as a vice president after Morsi's ouster but quit in protest to state crackdown on the Brotherhood.
ElBaradei tweeted that the attack reflects "the adversity in which we live," referring to his fears of violence between rival parties.
The Brotherhood appears to be angling to endure a crackdown that, while painful, also helps keep group cohesion under the pressure of a shared plight. It has publicly stuck to its most hard-line demands -- the reinstatement of Morsi as president and the restoration of the Morsi-era constitution.