Britain and six European allies Tuesday called for an immediate halt to violence targeting the Sudanese city of El-Obeid encircled by paramilitary forces, a statement issued by the UK Foreign Office said.
"There are now credible signs of an imminent offensive. This is a critical moment, and the international community must act," a joint statement signed by Britain, France, Germany, Ireland, Italy, the Netherlands and Norway said.
"We call on the RSF (Rapid Support Forces) to halt its attack immediately," it added.
The joint statement said repeated drone strikes over recent weeks had "killed civilians and driven acute shortages of fuel, food and water" with aid workers providing life-saving assistance also being "deliberately targeted".
"Civilians must be able to leave safely, and all parties must ensure rapid, safe and unhindered humanitarian access," the statement said.
Those attacking the city and their allies should "de-escalate, uphold international humanitarian law", it added.
UK Foreign Minister Yvette Cooper said there must not be a repeat of atrocities seen in the city of al-Fashir in 2025.
"Last year, the world watched in horror as the Rapid Support Forces raped, pillaged, and murdered their way through al-Fashir - leaving nothing but devastation and death in their wake. This cannot be repeated.
"El-Obeid is on the precipice of an atrocity that will deepen the wounds already inflicted on Sudan in El Fasher," she said in a statement.
The United States on Monday warned of the danger of "mass atrocities" in El-Obeid.
The city, in the Kordofan region of Sudan has been under siege for several months by RSF, which has been at war with the regular army since April 2023.
The UN Security Council on Saturday expressed the same concerns and called on paramilitary forces encircling El-Obeid to back down.
The conflict in Sudan has killed tens of thousands of people and forced more than 11 million from their homes, creating what the UN describes as the world's largest displacement and hunger crises.
