There were no clashes and no one was hurt but the incident triggered concerns that the military, which last week ousted Omar al-Bashir, Sudan's longtime president, after four months of street protests against his rule, could renege on its promises not to use force against the peaceful demonstrators.
The Sudanese Professionals Association, a group of teachers, engineers and doctors that initially spearheaded the campaign, has urged protesters to continue with the sit-in "until the revolution's demands are met".
"We call on our people to come immediately to the sit-in area to protect our revolution".
Thousands remained encamped outside Khartoum's army headquarters to keep up pressure on a military council that took power after ousting Bashir on Thursday.
Protesters have refused to leave until the military hands over power to a civilian-led transition team.
The military council met political parties on Sunday and urged them to agree on an "independent figure" to be prime minister, an AFP correspondent at the meeting said.
Protesters who are holding a sit-in which is entering is second week, have also been assured of security by the military.
But in a press conference, the council's spokesman did not respond to the protesters' latest demands.
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The United States, Britain and Norway urged the military council and other parties to hold talks over the country's transition to civilian rule.
The army also established a military council to run the country for a transitional period of two years.
An end to the state of emergency Bashir imposed on February 22.
During the meeting, Daqlo briefed the USA envoy on developments in Sudan and the reasons behind the formation of the transitional military council, the council said in a statement.
Dagalo, known by his nickname Hemedti, heads Sudan's Rapid Support Forces (RSF), which human rights groups have accused of widespread abuses in the western region of Darfur.
"This must be done credibly and swiftly, with protest leaders, political opposition, civil society organizations, and all relevant elements of society, including women".
Protest leaders say their demands include restructuring the country's feared NISS agency, whose chief Salih Ghosh resigned on Saturday.
A new interim civilian body should be given full executive powers, with the armed forces having representation, and the Transitional Military Council (TMC) that took over last week should be dissolved, the SPA said.
The SPA also demanded the confiscation of properties belonging to al-Bashir's National Congress Party and the release of soldiers who sided with their "revolution".