Six women and five men from Ethiopia are known to have died in a road accident in Somalia, the International Organization for Migration (IOM) says.
They were being transported by smugglers who reportedly planned to take them to Yemen via the port city of Bosaso, the IOM adds.
But the lorry carrying them overturned on Tuesday, a short distance from Bosaso. The IOM has only just released the details.
Investigations into how it happened are still under way, but at this stage local authorities say they believe the lorry had a mechanical issue and that no other vehicle was involved.
They confirm that 11 bodies have been buried. At least 20 other passengers were injured, the IOM says.