(Bloomberg) — As many as 20,000 refugees are missing after two camps in Ethiopia’s war-torn Tigray region were smashed, the United Nations said.

The refugees, most of whom are from neighboring Eritrea, fled from the Hitsats and Shimelba shelters which were destroyed in fighting that erupted in Tigray in November. In January, satellite images showed the destruction of two refugee camps sheltering thousands of Eritreans in the region