West African bloc ECOWAS said its leaders would meet on Thursday on the crisis in Niger, whose military rulers have defied its ultimatum to cede power or face possible military action.
The summit is to be held in Abuja, Nigeria, whose president Bola Tinubu is the current ECOWAS chairman.
Earlier on Monday, an ECOWAS source said West African nations were not envisaging an immediate military intervention at this stage.
In the meantime, Italy and Germany have called for a diplomatic solution in the troubled Sahel nation.
Neighbouring Mali said it and Burkina Faso — which have both been suspended from ECOWAS over their own military coups — were sending a joint official delegation to Niamey to show “solidarity (with) the people of Niger”.
They have said military intervention would be tantamount to a declaration of war.