"They have also said that the smuggler was already returned to Somalia to continue its business, and (...) bring back other migrants in Yemen (the way) by the same route", he added.
De Boeck called the suffering of migrants on the route enormous, especially during the current windy season on the Indian Ocean.
"They were all quite young, the average age was around 16", IOM spokeswoman Olivia Headon said. Yemen is now going through a conflict and humanitarian crisis but the migrants go there to try to reach Europe or the Gulf states.
According to the IOM, since January about 55,000 people - most of whom are teenagers from Somalia and Ethiopia - have left the Horn of Africa in an effort to transit Yemen in search of more sustainable conditions in oil-rich Middle Eastern nations. There are several refugee camps in southern Yemen, hosting Somali refugees.
Years of political chaos, combined with the rise of terror groups and deadly drought have driven many to leave Somalia.
Meanwhile some Ethiopians have left home after months of deadly anti-government protests and a 10-month state of emergency. Most victims were in their teenage years.
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