Al Jazeera has obtained footage showing violent clashes between Mubarak loyalists and pro-democracy protesters on the night between February 2 and 3.
In one clip, Mubarak loyalists are seen driving into a crowd of pro-democracy protesters, who then set upon them.
In another, shots are fired on protesters on a bridge.
Al Jazeera's Andrew Simmons in Cairo has more.
[Warning: the images in this footage may disturb some viewers.]