Spanish police believe the suspected migrants are of north African origin, and may have drowned while trying to reach Spain in a boat. Their bodies have been taken for autopsies to determine the cause of death.
Twenty people were rescued from the Mediterranean by Italian officials some 12 miles off Lampedusa on Wednesday. Meanwhile, Tunisian authorities intercepted more than 120 people enroute to Italy between Tuesday and Thursday.
The Greek coast guard has rescued 122 migrants near Rhodes. Meanwhile, the organization Alarm Phone reported a growing group of migrants had become stranded at the Evros River crossing.
The civil rescue ship Sea-Eye 4, carrying 87 migrants, was refused permission to enter a port in Malta at the weekend and has continued on to southern Italy in the hope of being able to dock there.