Crowds of demonstrators have been camped outside army headquarters since Saturday.
Sudanese protest organizers say they won't back a military coup that has apparently forced longtime President Omar al-Bashir to step down but want a civilian transitional government in place after his ouster.
A second witness said soldiers had intervened against the security agents.
Hundreds of mobile phones were held aloft, shining a sea of lights on the tide of people massed outside the buildings. He also said al-Bashir's crackdown against protesters risked splitting the security establishment and "could cause grave casualties".
"The time has come for the Sudanese authorities to respond to these popular demands in a serious way", the diplomatic missions of the three countries said.
"If you see Sudan's history, all our queens have led the state. It's part of our heritage", she said today.
Since then dozens of people have been killed by Government militia but protesters are undeterred, spurred on by frustration at the state of their country and their lives. Security forces tried repeatedly to break up the sit-in since Saturday, in violence that killed at least 22 people.
Tibor Nagy, the USA assistant secretary of state for Africa, said he was "heartened" at the relative calm overnight Tuesday after police ordered forces not to intervene.
"We call on the government of Sudan to respect the rights of all Sudanese people to express grievances peacefully", he tweeted.
"The Sudanese authorities must now respond and deliver a credible plan for this political transition".
Ahead of the expected army statement, Sudanese radio played military marches and patriotic music.
US House passes ‘net neutrality’ bill unlikely to become law
Brian Schatz of Hawaii, a top Democrat on the tech-focused Senate Commerce Committee, said in an interview last week. They may differ on how and what it should cover, but they still think we should do it".
NYC health officials warn against 'measles parties' amid biggest outbreak in decades
News of the order got a mixed reaction among Orthodox Jews in Williamsburg , the Brooklyn neighborhood affected by the order. Now any school out of compliance will immediately be issued a violation and could be subject to closure.
LILLEY: Trudeau accuses Scheer of lying
Some Liberal MPs are publicly disputing Philpott's claim that her rights have been breached. Wilson-Raybould that I consulted extensively with caucus over the preceding weeks".
Al-Qaeda founder Osama bin Laden lived in Sudan between 1992 to 1996.
On Tuesday, security agents had to abort bids to disperse the crowds when soldiers fired in the air to counter incoming volleys of tear gas from security agents.
"The right of peaceful demonstration is guaranteed by the constitution", said the NISS in a statement.
"Along with other security forces we have the capability to stop unlawful elements".
Police forces issued a communique saying they will never attack protesters.
"There was heavy firing of tear gas after which army soldiers opened the gates of the compound for protesters to enter", a witness said.
"Many shop owners and businessmen have offered us free supplies", said another demonstrator.
Crowds of demonstrators were singing and dancing to the tunes of revolutionary songs, witnesses said.
"Women of Sudan always encourage their youths to fight". Omar al-Bashir, with the support of military officers and an Islamist political party, took power as leader of a junta in his own coup on June 30, 1989.
Since Dec. 19, Sudan has been rocked by persistent protests sparked by the government's attempt to raise the price of bread, and an economic crisis including fuel and cash shortages.
Mr Al Bashir has been defiant despite the protests, and imposed a series of tough measures, such as declaring a state of emergency. The SPA called for protests to continue until power is handed over to a civil transitional government.