Tedros Adhanom Ghebreyesus said he was "appalled" by reports that 460 civilians had been killed in el-Fasher.
RSF troops executed a number of unarmed people after seizing el-Fasher, videos reviewed by BBC Verify show.
Sudan was thrown into disarray in 2023 when its army and a paramilitary group began a power struggle.
Two WFP officials are give 72 hours to leave without explanation - days after a key city falls to the RSF.
Opposition supporters accuse the government undermining democracy, and say the elections are not free and fair.
Reigning champions Nigeria qualify for next year's tournament alongside Cape Verde and Malawi who will make their Women's Africa Cup of Nations debut.
Hadush Kebatu arrived in Ethiopia on Wednesday after being removed on a flight last night.
The 91-year-old Nobel laureate in literature has been a critic of Trump's immigration policy.
The threat against Issa Tchiroma Bakary comes a day after he was declared the runner-up in disputed presidential polls.
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