Aid workers in Niger say the security situation has become untenable for thousands of Nigeriens in the Tillabéry region.

 This is where two deadly attacks took place on 2 January against two villages in Ouallam. 

This department is in the so-called "three borders" zone, close to Mali and Burkina Faso. 

Jean-Sebastien Josset, is the spokesman for the United Nations refugee agency, UNHCR in Niamey.