At least 49 people have died and around another 100 are missing after a boat capsized off the coast of Mauritania, coastguards in the north-west African country have said.
Seventeen people have been rescued and a search is continuing for other passengers aboard the dugout canoe that was heading towards Spain's Canary Islands.
According to survivors, the boat left The Gambia six days before Tuesday's accident, carrying around 160 people on board, mainly Gambian and Senegalese nationals.
The perilous journey over the Atlantic Ocean has become an increasingly common route for African migrants trying to reach Europe.
Nearly 47,000 people reached the Canary Islands last year and the Spanish non-government organisation Caminando Fronteras estimates more than 9,000 migrants died trying.
