Armed forces detained Sudan's prime minister over his refusal to support their "coup" on Monday, the information ministry said, after weeks of tensions between military and civilian figures who shared power since the ouster of autocrat Omar al-Bashir.
Civilian members of Sudan's ruling council and ministers in Hamdok's transitional government were also detained by the joint military forces, the ministry said in a statement on Facebook.
Internet services were cut across the country and the main roads and bridges connecting with the capital Khartoum shuttered, it added.
Dozens of demonstrators set car tyres on fire as they gathered on thestreets of the capital to protest against the detentions, an AFP correspondent said.
Civilian members of the transitional sovereign council and a number of ministers from the transitional government have been detained by joint military forces," the information ministry said.
“They have been led to an unidentified location,” it said.
It added later that "after refusing to support the coup, an army force detained Prime Minister Abdalla Hamdok and took him to an unidentified location".
US Special Envoy for the Horn of Africa Jeffrey Feltman said "the US is deeply alarmed at reports of a military takeover of the transitional government".
“This would contravene the Constitutional Declaration (which outlines the transition) and the democratic aspirations of the Sudanese people,” Feltman said in a statement on Twitter.
“Any changes to the transitional government by force puts at risk US assistance.”
Military coup
State television began broadcasting patriotic songs.
The Sudanese Professionals Association, an umbrella group of trade unions which were key in leading the 2019 anti-Bashir protests, denounced what it called a "military coup" and urged demonstrators "to fiercely resist" it.
The developments come just two days after a Sudanese faction calling for a transfer of power to civilian rule warned of a "creeping coup", at a news conference that an unidentified mob attacked had sought to prevent.
Sudan has been undergoing a precarious transition marred by political divisions and power struggles since the April 2019 ouster of Bashir.