Sudan's opposition alliance has described the suspension of talks with protesters by the ruling military council as a "regrettable decision".
On Wednesday, army generals and protest leaders were expected to decide on the make-up of a new body to govern Sudan for three years, following the ouster of longtime autocrat Omar al-Bashir last month.
After the military ousted al-Bashir and took over the country, the protesters remained on the streets, demanding that the ruling generals hand over power to civilians right away.
Talks between the two sides resumed earlier in the week but were marred by violence when an army major and five protesters were killed by unidentified gunmen at a long-running sit-in outside military headquarters in Khartoum.
The council head also said that the TMC has chose to remove all barricades in central Khartoum placed by protesters beyond a designated sit-in zone outside the Defense Ministry.
However, the two sides are yet to agree on a sovereign council - the top tier of power, where both want a majority.
"We made a decision to suspend the negotiations over civil rule for 72 hours to help prepare an atmosphere for completing the deal", Burhan said on Thursday, demanding that protesters dismantle roadblocks in Khartoum, open bridges connecting the capital and other regions and "stop provoking security forces".
Before the suspension, General Yasser al-Atta, one of the members of the current ruling military council, had vowed to reach a deal by early Thursday that "meets the people's aspirations".
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Demonstrators gathered outside military headquarters in Khartoum were fired upon last night.
"Military council must act to stop this now".
Sudan's season of mass protests, which eventually prompted the army to intervene and force Bashir from power, began in December 2018 as a modest demonstration over the rising price of foodstuffs.
Wednesday's crucial negotiations are due to start at 9:00 pm (1900 GMT), said Khalid Omar Yousef, a leader from the Alliance for Freedom and Change.
"People were walking towards the barricades and they (security forces) were firing shots at them", a 20-year-old demonstrator, who asked not to be named, said, showing a handful of empty bullet casings and referring to road blocks set up by protesters.
In a statement Monday, the office of Sudan's prosecutor-general said Bashir and others "have been charged for inciting and participating in the killing of demonstrators".
"We put the whole responsibility on the military council for what happened yesterday because it's their direct responsibility to guard and protect the citizens", Mohamed Naji al-Assam, a prominent figure in the movement, told reporters. On Monday, at least four people were killed when security forces tried to clear some protest sites - the first deaths linked to the Khartoum upheaval in several weeks.
The Alliance for Freedom and Change meanwhile said the shootings on Monday were an attempt to "disturb the breakthrough" in talks.