Sudanese demonstrators have protested the arrival of a top U.S. diplomat who is urging the government to accept an upgraded peacekeeping presence in Darfur.

Assistant Secretary of State for African Affairs Jendayi Frazer was greeted by an angry mob Saturday in Khartoum.  Police had to disperse the protesters, who carried banners with messages such as "You Want War, We Want Peace."

Frazer is in the capital to deliver a message from President Bush to Sudanese President Omar al-Bashir.

The diplomat has said the security situation in Darfur could further deteriorate if a United Nations force is not allowed to enter.  The Sudanese government has voiced strong objections to such a force.

The U.N. Security Council will meet next week to discuss a draft resolution that calls for the world body to take over for an African Union force that has not been able to stop the rampant violence in Darfur. 

Sudanese leaders have rejected the resolution, saying a foreign force in Darfur would violate the country's sovereignty.

Frazer has said the security situation could slide back to the level of violence that prevailed in 2004, which the United States termed genocide.

An estimated 200,000 people have been killed and two million people have been displaced in more than three years of fighting in Darfur.