Tensions remain high in Sudan following Monday's military takeover, amid widespread international condemnation and calls for the "immediate release" of prime minister Abdalla Hamdok who is under house arrest.

Protestors returned to the streets for the second day on Tuesday, closing down much of the capital Khartoum with burning tyres and roadblocks. Crowds marched through the streets chanting "down with military rule, our country is civilian."

The demonstrations continue despite reports of several people being killed and more injured after troops opened fire on protestors outside military headquarters.

Hospitals have reported treating numerous casualties. One injured protestor, Al-Tayeb Mohamed Ahmed, spoke of what he had witnessed.

"They (the military) fired stun grenades, then they fired live ammunition, two people died, I saw them with my own eyes," he said from his hospital bed.

There has been widespread international condemnation after General Abdel Fattah al-Burhan dissolved the joint military-civilian Sovereign Council and arrested political leaders, declaring a state of emergency.

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The coup comes just two years after the country's autocratic ruler, Omar al Bashir, was overthrown after decades in power and a joint military-civilian government created ahead of elections in 2023.

Under the power-sharing arrangement, the military was due to hand over the leadership of the council to civilians in the coming weeks. It appears it didn't want to relinquish control.

The Country's civil aviation authority suspended all inbound and outbound flights until October 30 following the unrest

The U.S. has frozen $700 million in aid to Sudan, with State Department spokesman Ned Price calling for an immediate release of the civilian leadership.

"The United States condemns the actions taken overnight by Sudanese military forces. The arrest of civilian government officials and other political leaders, including Prime Minister (Abdallah) Hamdok, undermines the country's transition to democratic civilian rule. The civilian-led transitional government should be immediately restored," Price said.

The European Union, the African Union and the African League have all expressed concern.

The United Nations also reacted swiftly. The UN Secretary-General Antonio Guterres issued a statement calling for the release of the prime minister immediately, while his spokesman, Stephane Dujarric declared the military actions unacceptable.

"The unlawful detention of the prime minister, government officials, and politicians is unacceptable and contravenes the Constitutional Document and the partnership critical for the success of Sudan's transition," Dujarric told reporters.

Hamdok and his wife are currently under arrest as are cabinet ministers and other civilian leaders.

In a televised address on Tuesday General Burhan said that Hamdok was safe and being treated well.

"The prime minister was staying at his home, but we were afraid he would be harmed. He is now staying with me at my home, we were sitting together yesterday evening and he is carrying on with his life normally. He will return home when the crisis is over and all threats are gone," General Burhan said.

Earlier the general blamed political in-fighting as the reason the military intervened and also said the army remains committed to the transition to civilian rule.

The United Nations security council is holding an emergency session later on Tuesday to discuss the crisis in Sudan.

Video editor: Nuno Fernandes