Violence has erupted in Cairo, initiated by pro-Mubarak forces

UPDATE @ 9:38 AM: CNN Is reporting that the Egyptian Army has entered Tahrir Square and tear gas has been fired. Also, men on horses and camels have been attacking the pro-democracy protesters.
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The situation in Cairo has turned ugly. Sounds like Mubarak has sent his thugs to wreak havoc. Al Jazeera's live blog is providing up-to-date coverage here. This is one of the latest updates:

3:27pm Al Jazeera reporting that more than 100 people have been injured in the past hour after suspected government supporters, including plain clothed policemen, entered Tahrir Square and attacked anti-Mubarak demonstrators.

And, here's the article from Al Jazeera:

Earlier, witnesses said thousands of pro-Mubarak supporters had entered the square. Opposition groups said Mubarak had sent in thugs to suppress the protest.

Also in Cairo, Al Jazeera's Jane Dutton, said that "hundreds of anti-government supporters were running from the square, including many women and children".

Fighting took place around army tanks deployed around the square, with stones bouncing off the armoured vehicles. Soldiers did not intervene.

Several groups were involved in fist fights, and some were using clubs. The opposition also said many among the pro-Mubarak crowd were policemen in plainclothes.

"Members of security forces dressed in plain clothes and a number of thugs have stormed Tahrir Square," three opposition groups said in a statement.

CNN's Anderson Cooper was in the middle of the mayhem. He also reported that the military is just standing by, not doing anything. And, Anderson reported he got punched in the head "ten times or so."

Mubarak chose to attack his own people. He's been doing that for decades. But, this time, the whole world is watching.