TUNIS, Tunisia—About 20 African migrants were found dead Thursday after their smuggling boat sank in the Mediterranean Sea while trying to reach Europe, Tunisian authorities said. Five survivors were rescued and the Tunisian navy is searching for up to 20 others still believed missing. Tunisian coast guard boats and local fishermen found and retrieved the bodies in the waters off the coastal city of Sfax in central Tunisia, Defense Ministry spokesman Mohamed Ben Zekri told The Associated Press. According to survivors, the migrant smuggling boat was carrying about 40 or 50 people heading toward Italy, Ben Zekri said. The boat was overloaded and in poor condition, and faced strong winds Thursday morning that may have contributed to the sinking, said National Guard spokesman Ali Ayari. It was carrying migrants from sub-Saharan Africa, he told AP. Tunisian navy units were searching for any more survivors. Tunisian authorities say they have intercepted …