Sudanese anti-coup protesters have been manning barricades in Khartoum a day after a deadly crackdown on mass rallies, as a defiant civil disobedience campaign against the military takeover entered its seventh day.

Tens of thousands turned out across the country for yesterday's demonstrations, marching against the army's 25 October power grab, when top General Abdel Fattah al-Burhan dissolved the government, declared a state of emergency and detained Sudan's civilian leadership.

The move sparked a chorus of international condemnation, with world powers demanding a swift return to civilian rule and calls for the military to show "restraint" against protesters.

At least three people were shot dead and more than 100 people wounded during yesterday's demonstrations, according to medics, who reported those killed had bullet wounds in their head, chest or stomach.

It takes the death toll since protests began to at least 11.

Police forces denied the killings, or using live bullets.

"No, no, to military rule," protesters carrying Sudanese flags chanted as they marched around the capital and other cities, as forces fired tear gas to break them up.

More than 100 people were also wounded yesterday, some suffering breathing difficulties from tear gas, the independent Central Committee of Sudan's Doctors said.

Sudan had been ruled since August 2019 by a joint civilian-military council, alongside Prime Minister Abdalla Hamdok's government, as part of the now derailed transition to full civilian rule.