Not Lessthan 20 peoples, including women and children, have been killed and food aid destroyed after militants attacked several vehicles in Somalia's central Hiiraan region.
"They put a bomb while people were in the car and blew it up," the Hiiraan's governor told the Dornlinsal Global Resources Somali service.
Islamist militant group al-Shabab has said it was targeting a government-affiliated armed group.
Somalia is facing worst drought in a decade.
Threat from al-Shabab militants, who want to overthrow the central government, also continues to grow.
The al-Qaeda-linked group controls much of southern and central Somalia, but has been able to extend its influence into areas controlled by the government, which is based in the capital Mogadishu.