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.
UN refugee agency UNHCR has denounced Tajikistan for its continued "forced" repatriation of Afghan refugees. The Central Asian country reportedly keeps deporting Afghans despite the human rights violations in their home country.
Libyan authorities combatting illegal migration said the boat embarked from Egypt and overturned off Libya. Officials did not say what caused the shipwreck.
Italy is scrambling to address overcrowded migrant shelters after scores of boats carrying a total of about 1,000 migrants reached its southern shores and the islands of Lampedusa and Pantelleria over the weekend.
Bulgarian police have detained more than 140 Afghans near Burgas on the Black Sea coast. Authorities have announced that security at the Turkish border will be stepped up.