Spanish coastguards rescued 23 Nigerian immigrants off the coast near Malaga in the early hours of Monday but 14 others remain missing, officials said.
The Nigerians were on board a small open boat which overturned 75 miles (120 km) off Motril, battered by waves reaching 13 feet (4 metres).
Spanish coastguards intercepted the boat at around 3 a.m. local time, rescuing 20 men and three women, one of whom was pregnant. They were taken to an immigrant centre in Motril.
Some of the immigrants said 37 of them were onboard the boat and those still missing included women and children, a government representative said in a statement.
Spanish police and coastguards are searching the area for any survivors.
Thousands of Africans are believed to have died attempting sea crossings to Spain in recent years, most of them trying to reach the Canary Islands in search of jobs.
Last Mod: 07 Temmuz 2008, 18:01