President Joe Biden has issued an executive order authorising sanctions against Sudan, saying the fighting must end.
Mr Biden called the violence a tragedy and a betrayal of the Sudanese people.
He said the violence in Sudan was "unusual and extraordinary threat to the national security and foreign policy of the United States".
Earlier, the director of National Intelligence, Avril Haines, told a US Senate committee that the conflict was likely to be protracted, as both sides believed they could win militarily and had few incentives to negotiate.
The latest ceasefire has failed to hold, with heavy fighting continuing in the capital Khartoum, as well as the adjoining cities of Omdurman and Bahri.
The World Food Programme has estimated that more than $13m (£10.3m) worth of food aid destined for Sudan has been looted since fighting broke out last month.
The WFP said pillaging in the country was rampant.
The UN children's agency, Unicef, warned the situation was teetering toward catastrophe, with youngsters increasingly caught in the crossfire.
Latest Stories
-
Town council in Canada at standstill over refusal to take King’s oath
26 mins -
Trump picks Pam Bondi as attorney general after Matt Gaetz withdraws
38 mins -
Providing quality seeds to farmers is first step towards achieving food security in Ghana
48 mins -
Kenya’s president cancels major deals with Adani Group
2 hours -
COP29: Africa urged to invest in youth to lead fight against climate change
2 hours -
How Kenya’s evangelical president has fallen out with churches
2 hours -
‘Restoring forests or ravaging Ghana’s green heritage?’ – Coalition questions Akufo-Addo’s COP 29 claims
2 hours -
Ensuring peaceful elections: A call for justice and fairness in Ghana
3 hours -
Inside South Africa’s ‘ruthless’ gang-controlled gold mines
3 hours -
Give direct access to Global Health Fund – Civil Society calls allocations
4 hours -
Trudeau plays Santa with seasonal tax break
4 hours -
Prince Harry jokes in tattoo sketch for Invictus
4 hours -
Akufo-Addo commissions 200MW plant to boost economic growth
4 hours -
Smallholder farmers to make use of Ghana Commodity Exchange
5 hours -
I want to focus more on my education – Chidimma Adetshina quits pageantry
5 hours