Several thousand Honduran and other Central American migrants waiting at the Mexico-Guatemala border in hopes of making it to the United States are in limbo this weekend as the Mexican government and the United Nations High Commissioner for Refugees decide whether and how the international organization will intervene.

On Thursday, Mexican Foreign Secretary Luis Videgaray asked U.N. Secretary-General Antonio Guterres to help process the migrants arriving at its southern border and deploy UNHCR personnel to determine which asylum requests are legitimate, and which are not. From there, refugees could be directed to an accepting country, including the U.S. or others.