At least 69 people have died and many more 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 who were 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.