Livelogging continues here. Below is a video made that reflects the pro democracy sentiment:
Update: the NYT reports on how the Mubarak government instituted the violence:
The deployment of plainclothes forces paid by Mr. Mubarak’s ruling party — men known here as baltageya — has been a hallmark of the Mubarak government, and there were many signs that the violence was carefully choreographed.
The Mubarak supporters emerged from buses. They carried the same flags and the same printed signs, and they all escalated their actions, from shouting to violence, at exactly the same moment: 2:15 p.m. The protesters showed journalists police and ruling party identification cards that they said had been taken from Mubarak supporters who had been caught infiltrating Tahrir Square, also known as Liberation Square, and detained in a holding pen.
The preparations for a confrontation began Wednesday morning, a day after Mr. Mubarak pledged to step down in September while insisting that he would die on Egyptian soil. The president’s supporters waved flags as though they were headed to a protest, but armed themselves as though they were itching for a fight. Several wore hard hats; one had a meat cleaver, and two others grabbed the raw materials to make firebombs from their car.
One man washed his pliers in a pool of dirty sewage before charging into a battle. Another man held a club wrapped in electrical tape and studded with tacks. Others carried knives, rubber tubes and chains. Before they laid siege to Tahrir Square in what seemed to be coordinated waves, they hid those weapons in their waistbands.