(All times are local in Egypt, GMT+2)
5:35 am At least four people have been killed in violence against anti-government protesters, Al Arabiya quoted a medical source at the scene.
5:14 am Ambulances are moving toward the bridge amid gunfire.
5:06 am Our correspondent says that anti-government protesters on the bridge seem to be running from gunfire. The AFP news service reports that a second protester has been shot and killed.
4:52 am Tanks andarmoured vehicles are pulling out of Tahrir Square, and one of our Web producer reports that two anti-Mubarak protesters are carried away, one shot in the head.
4:48 am AJE correspondents report that anti-government protesters have chased Mubarak supporters off the October 6 Bridge.
4:45 am Ramy Raoof, an anti-Mubarak activist at Tahrir Square, tells Al Jazeera that anti-government protesters are guarding all the entrances of the square as they are anticipating another attack from pro-Mubarak forces.
4:23 am Reuters reports that one protester has been killed. Our correspondent reports that the tank on the bridge has positioned itself is in the direction of the gunfire, toward where the anti-government protesters are, at a smaller square near Tahrir Square.
4:20 am Gunfire ricocheting off the October 6 bridge, with a tank moving toward where anti-government protesters are.
4:16 am AJE Web producer reports that there is automatic heavy caliber gunfire at Tahrir Square, which is probably the army trying to keep people at bay. "So much gunfire," he says. There are reports of seven people being wounded.
4:01 am Mubarak supporters take down a poster of the Egyptian president rather than risk having it burned by anti-government protesters, who were lobbing petrol bombs at it earlier.
3:46 am Skirmishes continue, with rocks and Molotov cocktails being fired off between anti-government protesters and Mubarak's supporters.
3:15 am Anti-government protesters are collecting rocks at a couple of the entrances to Tahrir Square in preparation to an attack. One of our Web producers reports that almost everyone in the square seems injured, is bandaged and limping. The mood there is "pretty fatalistic" with the anti-government protesters certain that the pro-Mubarak forces are "there to eliminate them".
3:01 am Al Jazeera's correspondent and Web producer report: Heavy police presence at the national museum, with anti-government protesters banging on metal railings and rocks raining down. Pro-Mubarak protesters have an "endless supply of molotov cocktails" that they're tossing at the anti-government demonstrators.
2:26 am AJE Web producer reports that tension is rising at Kasr al Nil (bridge) entrance to Tahrir Square, saying "They expect an attack here."
2:03 am The fire at the residential building seems to have subsided.
1:47 am Al Jazeera correspondent, reporting from just off Tahrir Square reports that dozens of Mubarak supporters have erected a barricades on either side of a road, trapping anti-government protesters. They are also gathering stones, breaking streetlights and putting on balaclavas, covering their faces, apparently in preparation for a fresh standoff with anti-government protesters. Sources tell our correspondent that the men preparing for the standoff are police officers.
1:35 am Despite fires both at Tahrir Square and at a residential building, an AJE correspondent reports that there is no military intervention and there are no fire trucks on the scene.
1:17 am There are several cars on fire at Tahrir Square
1:01 am Pro-Mubarak supporters retreat to an overpass, where they are tossing petrol bombs at the crowd below. The army is not doing anything to intervene.
12:51 am A standoff is taking place in front of Egypt's national museum, where rocks and petrol bombs are flying.
12:45 am AJE Web producer, reporting from Tahrir Square says large caliber shots are being fired by the Egyptian army. It seems that they're "shooting in the air.'
12:15 am Mustafa Hussein, a physician working in a makeshift hospital set up near Tahrir Square, tells Al Jazeera that the square is "in less chaos" and that the hospital is flooded with calls offering supplies. He also said that many of the injuries he saw today were head injuries as a result of protesters being pelted by rocks.
12:10 am AJE Web producer, reporting from Tahrir Square, reports no police presence at this point, and says that the anti-government protesters outnumbered the pro-Mubarak supporters.
12:00 am Live blogging continues from our headquarters in Doha.
