D-Squared was right. From Al-Jazeera:
Meanwhile, another Al Jazeera correspondent said men on horseback and camels had ploughed into the crowds, as army personnel stood by.
At least six riders were dragged from their beasts, beaten with sticks by the protesters and taken away with blood streaming down their faces.
One of them was dragged away unconscious, with large blood stains on the ground at the site of the clash.
The worst of the fighting was just outside the world famous Egyptian Museum, which was targeted by looters last week.
Al Jazeera’s correspondent added that several a group of pro-government protesters took over army vehicles. They also took control of a nearby building and used the rooftop to throw concrete blocks, stones, and other objects.
Soldiers surrounding the square took cover from flying stones, and the windows of at least one army truck were broken. Some troops stood on tanks and appealed for calm but did not otherwise intervene.
Many of the pro-Mubarak supporters raised slogans like “Thirty Years of Stability, Nine Days of Anarchy”.
Satisfying to see those fuckers on horses being dragged down and hurt, but it shows the desparation of the Mubarak regime that it would try and hire thugs to suppress the revolution. As Lenny said, The ruling class never does anything for itself; counter-revolutions always depend on coopting middle and working class people. There are plenty of numbnuts wanting to break heads for five dollars a day.