Children writing on sheets of paper at a school catering for migrants, most of whom are from Somalia. The United Nations Refugee Agency (UNHCR) has raised concerns over the record numbers of Ethiopians and Somalis flocking to Yemen, despite the deteriorating security situation there. In 2011 103,000 migrants crossed the Gulf of Aden and Red Sea. Most arrive dehydrated and malnourished and face physical and sexual attacks. They are regularly robbed and attacked by smugglers and traffickers.