The April 6 youth movement holds President Mohamed Mursi, and the Muslim Brotherhood to which he belongs, responsible for confrontations that erupted on Wednesday between supporters and opponents of the president.
In a statement issued on Wednesday the prominent youth group considered the presidential calls for dialogue a media stunt.
April 6 member Mohamed Adel said that the president is politically responsible for the current crisis, especially after Islamists headed to where his opponents had begun a sit-in.
Adel accused the presidency of blocking any means of dialogue with revolutionary forces and failing to listen to their demands regarding a decree issued by Mursi and a controversial draft constitution written by an Islamist-dominated assembly.
Clashes erupted earlier on Wednesday between opposition forces and supporters of Mursi outside the presidential palace in Cairo where the two exchanged stone-throwing.
Mursi's supporters took down the tents set up on Tuesday by the president's opponents and forced them out of the area.