The United Nations says it is concerned about worsening security at refugee camps in Kenya and Ethiopia that are home to more than 700,000 Somali citizens.
The U.N. refugee agency says it is particularly worried about the situation in Kenya's massive Dadaab camp following a spate of kidnappings, murders and robberies there.
A spokesman for the U.N. High Commissioner for Refugees says Kenyan police are investigating whether the Dadaab attacks are being carried out by outsiders or by people within the camp.
Andrej Mahecic told reporters in Geneva on Friday that formal registration of new arrivals stopped in October following the kidnapping of foreign aid workers.
He says 1,600 people who have arrived since then didn't undergo security screening.