Sumario del día de The Guardian:
Here's a summary of events so far today
• Thousands of pro-Mubarak supporters have attacked pro-democracy supporters in central Cairo. Some rode in on horses and camels (1.24pm). Many brandished iron bars and baseball bats and they have also thrown rocks and ripped up bits of pavement to create weapons.
• Pro-democracy protesters have fought back and managed to keep control of Tahrir Square as clashes took place in all the side streets around Cairo's central plaza (4.43pm).
• Eyewitnesses say hundreds of people have been injured. An unconscious boy, no more than 8-years-old, was among those seen being carried away for medical treatment. The health ministry said one person has been killed in Tahrir Square and 403 people injured (5.49pm)
• The violence of the pro-Mubarak supporters appears to be organised, with policemen and hired thugs seemingly involved. The UK prime minister, David Cameron, said it would be "completely unacceptable" if the government was involved (3.16pm). The Egyptian interior ministry has denied any involvement but has made no attempt to intervene in the clashes.
• Mohamed ElBaradei has urged the army to intervene to stop the violence in Cairo (3.24pm). He told the Guardian the determination not to negotiate with the Mubarak regime had been strengthened by today's events and people now want to see the Egyptian leader put on trial (5.52pm).
• Pro-Mubarak protesters have also taken to the streets in Alexandria but so far there have not been the violent scenes seen in Cairo. (5.30pm)
• Ahead of a planned protest in Yemen, president Ali Abdullah Saleh has said he won't seek re-election in 2013. Analysts say he is up to his old tricks. (9.31am)