Clashes have resumed in Cairo between supporters and opponents of Egyptian President Hosni Mubarak.
Rocks were thrown between the two camps despite a buffer zone designed to separate them created by the army.
At least four people were shot dead and 13 others were wounded as the battle for Tahrir Square in central Cairo took on an increasingly violent turn overnight.
Pro-Hosni Mubarak supporters are said to have opened fire on anti government protesters.
Egypt’s army began deploying tanks in among the protesters and managed to create a buffer zone of around 80 metres.
The night time deaths add to those killed yesterday, underlining just how dangerous the demand for democracy has become. Many see the increase in violence as an attempted government-backed crackdown on the pro-democracy demonstrations which have now moved into their tenth day.
Mubarak promised on Tuesday to surrender power in September to try to defuse the unprecedented challenge to his 30-year-rule. But his refusal to go immediately has angered protesters.
Hours later, the army told the reformists to go home as Mubarak backers, throwing petrol bombs and wielding sticks, gathered on the outskirts of the central square and tried to gain entry.
Now the government is urging the protesters to go home before talks over constitutional change can begin. But the activists are refusing, building up to Friday when they plan a march on the presidential palace.