Sub-Saharan African migrants are rescued by the Libyan coastguard after their inflatable boat started to sink off the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Sub-Saharan African migrants are rescued by the Libyan coastguard after their inflatable boat started to sink off the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA        (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

TRIPOLI, LIBYA - JULY 17: The illegal immigrants who rescued by Libyan coastguard after their boat started to sink off the coastal town of Garabulli in Tripoli, Libya, on July 17, 2014. Almost 100 immigrants are rescued and 4 killed after their boat is sinked off. (Photo by Hazem Turkia/Anadolu Agency/Getty Images)

TRIPOLI, LIBYA - JULY 17: The illegal immigrants who rescued by Libyan coastguard after their boat started to sink off the coastal town of Garabulli in Tripoli, Libya, on July 17, 2014. Almost 100 immigrants are rescued and 4 killed after their boat is sinked off.  (Photo by Hazem Turkia/Anadolu Agency/Getty Images)

Sub-Saharan African migrants arrive in the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli after they were rescued by the Libyan coastguard after their inflatable boat stated to sink in the waters near the town on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Sub-Saharan African migrants arrive in the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli after they were rescued by the Libyan coastguard after their inflatable boat stated to sink in the waters near the town on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA        (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Sub-Saharan African migrants pray as they arrive in the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli after they were rescued by the Libyan coastguard after their inflatable boat stated to sink in the waters near the town on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Sub-Saharan African migrants pray as they arrive in the coastal town of Guarabouli, 60 kilometres east of the capital Tripoli after they were rescued by the Libyan coastguard after their inflatable boat stated to sink in the waters near the town on November 20, 2014. There were 108 people rescued from the sinking raft. Mired in unrest and political chaos, Libya has been a launchpad for illegal migrants trying to reach Europe and who turn to people smugglers to cross the Mediterranean, mainly to Italy. AFP PHOTO / MAHMUD TURKIA        (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Migrants rescued by Libyan coastguard after their boat sank on August 28, 2015, sit in a security center between the coastal cities of Subrata and Zuwara, west of the capital Tripoli. At least 76 people were confirmed to have died after the ship carrying hundreds of migrants sank off the coast of Libya, a spokesman for the Libyan Red Crescent said. AFP PHOTO / MAHMUD TURKIA (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)

Migrants rescued by Libyan coastguard after their boat sank on August 28, 2015, sit in a security center between the coastal cities of Subrata and Zuwara, west of the capital Tripoli. At least 76 people were confirmed to have died after the ship carrying hundreds of migrants sank off the coast of Libya, a spokesman for the Libyan Red Crescent said. AFP PHOTO / MAHMUD TURKIA        (Photo credit should read MAHMUD TURKIA/AFP/Getty Images)