At least two people have died and 186 others are missing after four boats carrying migrants from Africa capsized overnight in waters off Yemen and Djibouti, the U.N.'s migration agency said on Friday.

Two vessels capsized off Yemen late Thursday, said Tamim Eleian, a spokesperson for the International Organization for Migration, or IOM. Two crewmembers were rescued, but 181 migrants and five Yemeni crewmembers remain missing, he told The Associated Press.

Two other boats capsized off the tiny African nation of Djibouti around the same time, he said. Two bodies of migrants were recovered, and all others on board were rescued.

Strong winds caused the two boats to capsize near the beach in Djibouti after they started sailing off, Abdusattor Esoev, head of the IOM mission in Yemen, told AP.

The third boat, which capsized off Dhubab district in Taiz governorate, southwestern Yemen, was carrying 31 Ethiopian migrants and three Yemeni crew.

Yemen is a major route for migrants from East Africa and the Horn of Africa trying to reach Gulf countries for work, with hundreds of thousands attempting the route each year. To reach Yemen, migrants are taken by smugglers on often dangerous, overcrowded boats across the Red Sea or Gulf of Aden.

The numbers making it to Yemen reached 97,200 in 2023 — triple the number in 2021. Last year, the number dropped to just under 61,000, probably because of greater patrolling of the waters, according to an IOM report this month.

Over the past decade, at least 2,082 migrants have disappeared along the route, including 693 known to have drowned, according to the IOM. Some 380,000 migrants are currently in Yemen.