For a year the Sudan Army has been in a fight with a paramilitary force called 'Rapid Support Forces' (RSF)
From last year's report

Human Rights Watch described its forces as “men with no mercy”.
Sudan unrest: What are the Rapid Support Forces? | News | Al Jazeera

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The army and RSF had been in a fragile partnership after toppling a civilian government in an October 2021 coup, a move that derailed a transition from the rule of Islamist autocrat Omar al-Bashir, who was ousted amid a popular uprising in 2019.
The rivalry between the two sides burst into the open over an internationally backed plan that would have launched a new transition with civilian parties and was due to be sealed just before the war broke out.

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Why is Sudan still at war a year on? | Reuters

The dispute is integrating the RSF into the regular army.

This happened in Israel during the forming of the nation. But that bloody crisis lasted only 3 days and did not get civilians in the crosshairs.

“Jews Shooting Jews”: A Look Back at the Days of the Altalena Affair (nli.org.il)

In Sudan more than 8.5 million civilians have been driven from their homes creating a refugee crisis .

Sudan's uprooted millions pay price for year-long war | Reuters