The U.N. immigration agency reports that a boat carrying African migrants that capsized off Yemen's coast has killed 56 and left 132 missing, revising casualty figures released earlier.

At least 76 people have been killed and dozens are missing after a boat carrying mostly Ethiopian migrants sank off Yemen in the latest tragedy on the perilous sea route, officials said.

A boat carrying migrants from the Horn of Africa went down off the southern coast of Yemen, with the loss of at least 68 lives. More than 75 are still missing.