Russian FM Sergey Lavrov says Sudan and other countries have right to turn to Wagner mercenary group's services amid fighting raging between forces loyal to country's two top generals since April 15.
Witnesses report air strikes and paramilitary forces fire anti-aircraft weapons while WHO warns of "huge biological risk" after fighters occupy laboratory in capital Khartoum.
Around 5,000 people reach the border town of Renk in South Sudan, however, the number would be bigger than that, according to local media reports.
Loud explosions and heavy gunfire were heard in the capital on Wednesday morning, as witnesses said plumes of thick black smoke emanated from buildings around the army headquarters in central Khartoum.
Tensions have been brewing for weeks between Sudan's two most powerful generals, who just 18 months earlier jointly orchestrated a military coup to derail the nation's transition to democracy.
The pope had promised to travel to South Sudan, when he hosted rival leaders Salva Kiir and Riek Machar at a Vatican retreat but four years since that meeting violence remains a problem in the country.
The "pilgrimage of peace" is the first-ever papal visit to the country since the predominantly Christian nation gained independence from Muslim-majority Sudan in 2011.
UN agencies express 'grave concern' over ongoing violence and call on South Sudan's leaders to investigate and hold accountable all perpetrators of the conflict.
A government official says 56 people have lost their lives in four days of ethnic clashes in the eastern Jonglei state.
Authorities declared a state of emergency and imposed a nighttime curfew in Beleil to help stop the clashes.
Conflicts in Sudan's far-flung regions have killed around 900 people this year and driven almost 300,000 from their homes, UN office reports.
Deadly conflict is a continuation of fighting that started in August in a village in Upper Nile over grazing areas and use of natural resources and has since spread to other states.
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