Witnesses said heavy gunfire was heard south of the Sudanese capital, Khartoum. reutersThat followed days of tension between the army and a powerful paramilitary group, which has warned of a confrontation.
The source of the firing was not immediately known.
The rift between the forces came to the surface on Thursday, when the army said that recent activities by the Rapid Support Forces (RSF), a powerful paramilitary group, were without coordination and illegal.
On Friday and Saturday morning, the heads of both the army and the RSF told mediators that they were prepared to take steps to ease the situation.
A clash between them could spark a prolonged conflict in a vast country that is already dealing with an economic breakdown and flare-ups of tribal violence.