KHARTOUM, SUDAN -- A pro-military minister in Sudan says time is running out for the country's deposed prime minister to agree to take a post in a military-led government after top generals seized power last month.

Security forces, meanwhile, opened fire on thousands of anti-coup protesters in the capital, Khartoum, and its twin city of Omdurman, killing at least 15 people, according to doctors. Wednesday's tally was the highest daily count of people killed since the Oct. 25 coup.

The crackdown on protesters has come as U.S. Secretary of State Antony Blinken is in Africa to boost thus-far unsuccessful U.S. diplomatic efforts to resolve the deepening conflicts in Ethiopia and in Sudan.

Prime Minister Abdalla Hamdok is currently under house arrest in the capital of Khartoum. He and more than 100 other government officials were detained during the coup. Many have been kept in undisclosed locations.

"The country cannot wait forever, so if he doesn't take the job, then someone else will definitely take it," Gibreil Ibrahim, the finance minister of the deposed government, told The Associated Press late Tuesday.

Speaking from his office in Khartoum, Ibrahim said calls by some pro-democracy groups, the United States and its western allies to return the pre-coup transitional government are "unrealistic." Negotiations have focused on convincing Hamdok to lead a technocratic cabinet that runs day-to-day affairs, he said.

Ibrahim, 66, is a rebel leader who joined the government earlier this year after the transitional administration reached a peace deal with a rebel alliance, ending years of civil war. He was one of those leading protests against Hamdok and others in Khartoum before the top generals initiated their coup.

He spoke to the AP ahead of rallies Wednesday in Khartoum and other cities across the country against the military's takeover. Authorities have shut bridges linking Khartoum and its twin city of Omdurman and tightened security across the capital. Security forces fired live ammunition and tear gas at anti-coup protesters in at least one location in Khartoum, according to activists.

The Sudan Doctors Committee said most of the killings took place in Khartoum's district of Bahri. It said dozens of others were wounded, as security forces used what the committee called, "brutal repression" against protest rallies.

A spokesman for Sudanese police did not respond to calls seeking comment.

The top U.S. diplomat for Africa, Molly Phee, condemned the violence against protesters and called for "the respect and protection of human rights in Sudan."

Magdy Mohamed Osman, a researcher with Human Rights Watch in Sudan, said the developments show the military has taken "their power grab" to a new level. He added that security forces have employed "extreme levels of brutality" against the protesters 鈥 including attacking health care facilities.

Wednesday's fatalities brought the death toll since the Oct. 25 coup to at least 39 people killed and hundreds wounded in protests since Oct. 25, according to the doctors committee.

An advocacy group said that Sudan has been experiencing a near-total telecommunications blackout amid Wednesday's protests. NetBlocks said that internet access remains largely disrupted across the country since the coup, despite a court ruling to restore services.

The Sudanese military seized power Oct. 25, dissolving the transitional government and arresting dozens of officials and politicians. The takeover upended a fragile planned transition to democratic rule, more than two years after a popular uprising forced the removal of longtime autocrat Omar al-Bashir and his Islamist government.

The coup has drawn international criticism and massive protests in the streets of Khartoum and elsewhere in the country for the past three weeks.

The U.S. has retaliated for the coup by suspending $700 million in direct financial assistance. The World Bank also suspended disbursements for its operations in Sudan, whose economy has been battered by years of mismanagement and sanctions. It also was dealt a blow when the oil-rich south seceded in 2011 after decades of war, taking with it more than half of public revenues and 95 per cent of oil exports.

Ibrahim, who earned a PhD in economy at Japan's Meiji University, urged the international community to weigh on the policies of the new government, regardless those leading it. He said it doesn't matter who the next prime minister is. "If the policies are good, then Sudan should receive financial support," he said.

Cracks, meanwhile, have started to surface among members of the broader pro-democracy movement. The main protests groups have insisted on the military fully handing power over to civilians.

Other political parties and groups have demanded a return to the power-sharing deal that established the deposed transitional government late in 2019, as well as a full handover to civilians to lead the transition to democracy.

Ibrahim, however, dismissed such demands. He argued that the situation has changed since the coup 鈥 an apparent reference to military's tightening grip on power.

"It is rather unrealistic to say, 'Either we turn to October 23rd or 24th or we are not going to talk to you,"' he said. "There is a new reality, and we need to look into it."

Gen. Abdel-Fattah Burhan reappointed himself as the chairman of newly formed sovereign council, in a move that angered the protesters and frustrated the U.S. and its western allies.

Phee, the U.S. diplomat, met Tuesday with Hamdok, Burhan and others, part of ongoing mediation efforts to reach a compromise between civilians and the generals.

Burhan said the leaders of Sudan were willing to engage in dialogue with all political forces without conditions. He also said the military have already started releasing political prisoners who don't face criminal charges.

Ibrahim said those detained, including Hamdok, would be free "very soon."

"I don't expect these people to stay in detention for long," he said.

Magdy reported from Cairo.