CAIRO, Egypt (AP) – The conflict in Sudan has displaced more than two million people, the United Nations said on Wednesday, as a UN official warned that escalating attacks in Darfur city could amount to “crimes against humanity”.

Sudan has plunged into chaos since mid-April when months-long tensions between the military and its rival, the paramilitary Rapid Support Forces, exploded into open fighting in the capital, Khartoum, and elsewhere across the north-eastern African nation.

The fighting continued unabated Wednesday in parts of the capital and the western region of Darfur, both have seen some of the worst battles. At least 959 civilians have been killed and about 4,750 others were wounded as of June 12, according to Sudan’s Doctors Syndicate, which tracks civilian casualties.

The brutal clashes have forced more than 1.6 million people to leave their homes for safer areas inside Sudan, according to the International Organization for Migration (IOM). About 530,000 others fled to the neighbouring countries of Egypt, South Sudan, Chad, Ethiopia, the Central African Republic, and Libya, the agency said.

The medical group said the toll could be much higher, given it was unable to take into account those who were killed or wounded in the ongoing clashes in Genena, the provincial capital of West Darfur. The city’s hospitals have been out of service since the fighting erupted there in April, the group said.

All of Sudan’s 18 provinces experienced displacement, with Khartoum at the top of the list with around 65 per cent of the total number of displaced people, followed by West Darfur with over 17 per cent, according to the IOM’s Displacement Tracking Matrix.

In Genena, the provincial capital of West Darfur, the RSF and allied Arab militias rampaged through the city over the past week, killing and wounding hundreds of people, according to local activists and UN officials.

Activists and residents in Genena reported dozens of women were sexually attacked inside their homes and while trying to flee the fighting. Almost all rape cases were blamed on the RSF, which didn’t respond to repeated requests for comment.

Khamis Abdalla Abkar, the provincial governor of West Darfur province, accused the RSF and allied militias of attacking local communities across Genena. In a phone interview on Wednesday with Saudi-owned television station, Al-Hadath, he urged the international community to intervene to protect civilians in his province.

Volker Perthes, the UN envoy in Sudan, said Tuesday the fighting in Genena has taken “an ethnic dimension,” with Arab militias and armed men in RSF uniforms showing “an emerging pattern of large-scale targeted attacks against civilians based on their ethnic identities.”

Such attacks, “if verified, could amount to crimes against humanity”, he warned.

Alice Wairimu Nderitu, the UN special adviser on the prevention of genocide, also condemned “the shocking violence” in Genena. She warned in a statement Tuesday that such fighting could turn into “renewed campaigns of rape, murder, and ethnic cleansing amounting to atrocity crimes”.

Darfur had been the scene of genocidal war in the early 2000s, when ethnic Africans rebelled, accusing the Arab-dominated government in Khartoum of discrimination. Former dictator Omar al-Bashir’s Government was accused of retaliating by arming local nomadic Arab tribes, known as Janjaweed, who targeted civilians.

The Janjaweed later evolved into the RSF.