Forty-one migrants have died in a shipwreck off the Italian island of Lampedusa, survivors reported to Italian media.
The four survivors, originally from the Ivory Coast and Guinea, reached Lampedusa on Wednesday.
Tunisian authorities say Sfax, a port city about 80 miles (130km) from Lampedusa, is a popular gateway for migrants seeking safety and a better life in Europe.
In recent days, Italian patrol boats and charity groups have rescued another 2,000 people who have arrived on Lampedusa, reports the BBC.
Over 1,800 people have lost their lives this year in the crossing from North Africa to Europe.