Forty-three migrants drowned after their boat sank off the coast of Tunisia, according to the Tunisian Red Crescent.
The migrants had left from the Libyan port of Zuwara and were trying to cross the Mediterranean to reach Europe.
84 others were rescued by the Tunisian navy, said Tunisian Red Crescent chief Mongi Slim.
The summer weather has seen an increase in the number of migrants trying to reach Europe from North Africa.
The boat, which set sail on Monday evening, was carrying people from Egypt, Sudan, Eritrea and Bangladesh, the Red Crescent said. The vessel capsized after its engine failed.
The people rescued, off the Tunisian fishing port of Zarzis, were between three and 40 years old, according to the Tunisian Ministry of Defense.
The Tunisian Red Crescent gave them food and drink while seeking space to house them during Covid’s required isolation period, local media radio reported.
Libya has been a key transit point for migrants from many countries trying to reach Europe via the Mediterranean.
But Tunisia has also become a major hub and called on the European Union to tackle migration by helping to fight poverty in Africa.