The Egyptian president Hosni Mubarak has dismissed his government promising reform and saying that he will replace it with a new one today.In an address to the nation at midnight, after four days of deadly protests, he said that he has asked the government to resign and there will be a new government. The president said that change cannot be achieved through chaos but through dialogue.Saying he understood that the people of Egypt wanted him to address poverty, employment and democratic reform, he promised to press ahead with social, economic and political reforms. He also defended the security forces' action, saying he had given them instructions that the protesters be allowed to express their views. But, he said, acts of violence and vandalism left the security forces with no choice but to react to restore order.US President Barack Obama said he had spoken to Mubarak just after his address and called on Egyptian authorities to refrain from using violence against peaceful protesters.Meanwhile, throughout the night, protesters were out on the streets of Cairo, battling police with stones and firebombs, burning down the ruling party headquarters, and defying a night curfew enforced by a military deployment.Twenty-seven people are reported to have been killed and over one thousand injured during the clashes. The United States has threatened to reduce its 1.5 billion dollar programme of foreign aid if Egypt escalates the use of force.