Thousands of children born in Colombia to Venezuelan mothers are stuck in legal limbo with no identity documents, putting them at risk of statelessness, the United Nations Refugee Agency (UNHCR) warned on Thursday.

Nearly 1.3 million Venezuelans have settled in neighboring Colombia, fleeing a political and economic crisis in their homeland that has caused severe shortages of food and medicine.

About 20,000 children of Venezuelan parents have been born in Colombia, according to government figures, and many are not eligible for either nationality, leaving them stateless.