I think most of the events in Sudan happen in Khartoum, but were some firing in all over Sudan.
Wikipedia tells me that the coupists were forced to make compromise and share the power with previous government, as they laid down in a 14-point deal. Need to read this deal.
It seems some don't agree with the timeshare type of government, and now the initiator of previous coup, general Abdel Fattah al-Burhan, is the one who gets attacked - since he is the de facto leader of the country, and the one who made the deal with the previous government.
So the current attackers is the Rapid Support Forces (RSF), a paramilitary group, now labeled as rebels by al-Burhan. It is not clear for me where they stood in the 2021 coup.