At least 139 migrants, including 15 children, have died after a boat capsized off Djibouti, the International Organization for Migration said Sunday. Another 84 people are still missing.

The boat was carrying 305 people from Djibouti toward Yemen when it went down near Guhere, north of the port town of Obock, on Thursday night or early Friday. About 82 people survived. All of them are from Ethiopia, the IOM said.

The toll rose from 109 on Sunday after crews recovered 30 more bodies. The count includes only those buried by Djiboutian authorities, IOM mission chief Alexandre Coissac told the Associated Press. Others were buried by fellow migrants and will not be added until officials can verify them.

"This is a devastating loss of life," Coissac said. "Our thoughts are with the survivors and the families who have lost loved ones or remain without news of their relatives."

The IOM called it one of the deadliest wrecks ever recorded on the "Eastern Route." Tens of thousands of people from the Horn of Africa make that crossing each year. They sail across the Bab el-Mandeb Strait to Yemen, then try to reach Saudi Arabia and other Gulf states to find work.

Yemen is in a civil war that has lasted more than a decade, and fighting there has grown worse in recent weeks. Still, migrants keep coming, driven by poverty, insecurity and climate shocks. The IOM said it has tracked more than 20,000 movements from Ethiopia into Djibouti since Sept. 10.

The agency is giving survivors health care, food and help reaching their families at its center in Obock.

What we know: At least 139 people died and 84 are missing after a boat with 305 people aboard sank off Djibouti, and about 82 Ethiopians survived.
What we don't: The final death toll, what caused the boat to capsize, and who organized the crossing.