A migrant rests after disembarking from the expedition vessel Phoenix in the Sicilian harbour of Augusta, Italy June 17, 2015. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

A child walks as migrants rest after disembarking from the expedition vessel Phoenix in the Sicilian harbour of Augusta, Italy June 17, 2015. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

Migrants rest after disembarking from the expedition vessel Phoenix in the Sicilian harbour of Augusta, Italy June 17, 2015. REUTERS/Antonio Parrinello 

A staff member puts an identification number on a rescued migrant's hand as she disembarks at the Pozzallo harbour, Italy, June 9, 2015. Some 447 migrants were brought into the Sicilian port of Pozzallo after being rescued at sea by the Italian coastguard. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

A rescued female migrant gestures from a bus after arriving at Pozzallo harbour, Italy, June 9, 2015. Some 447 migrants were brought into the Sicilian port of Pozzallo after being rescued at sea by the Italian coastguard. REUTERS/Antonio Parrinello 

Rescued migrants wait to disembark as they arrive at Pozzallo harbour, Italy, June 9, 2015. Some 447 migrants were brought into the Sicilian port of Pozzallo after being rescued at sea by the Italian coastguard. REUTERS/Antonio Parrinello 

Red Cross members help a migrant after he disembarked in the Sicilian harbour of Augusta, Italy, May 31, 2015. The corpses of 17 migrants were brought ashore in Sicily aboard an Italian naval vessel on Sunday along with 454 survivors as efforts intensified to rescue people fleeing war and poverty in Africa and the Middle East. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

A migrant rests after disembarking from Italian Navy vessel Fenice in the Sicilian harbour of Augusta, Italy, May 31, 2015. The corpses of 17 migrants were brought ashore in Sicily aboard an Italian naval vessel on Sunday along with 454 survivors as efforts intensified to rescue people fleeing war and poverty in Africa and the Middle East. REUTERS/Antonio Parrinello

A group of migrants walk after arriving in the Sicilian harbour of Augusta, Italy, May 31, 2015. The corpses of 17 migrants were brought ashore in Sicily aboard an Italian naval vessel on Sunday along with 454 survivors as efforts intensified to rescue people fleeing war and poverty in Africa and the Middle East. REUTERS/Antonio Parrinello

A migrant disembarks from Italian Navy vessel Fenice after arriving in the Sicilian harbour of Augusta, Italy, May 31, 2015. The corpses of 17 migrants were brought ashore in Sicily aboard an Italian naval vessel on Sunday along with 454 survivors as efforts intensified to rescue people fleeing war and poverty in Africa and the Middle East. REUTERS/Antonio Parrinello

Staff members carry a coffin in the Sicilian harbour of Augusta, Italy, May 31, 2015. The corpses of 17 migrants were brought ashore in Sicily aboard an Italian naval vessel on Sunday along with 454 survivors as efforts intensified to rescue people fleeing war and poverty in Africa and the Middle East. REUTERS/Antonio Parrinello

Migrants wait to disembark in the Sicilian harbour of Augusta, Italy, May 30, 2015. Close to 1,000 migrants rescued in on-going operations are brought safely to port in Sicily as Italian authorities say over 4,000 migrants have been saved from the Mediterranean in twenty-four hours and 17 migrants have been found dead on a boat. REUTERS/Antonio Parrinello

A staff member stands next to migrants after disembarkment in the Sicilian harbour of Augusta, Italy, May 30, 2015. Close to 1,000 migrants rescued in on-going operations are brought safely to port in Sicily as Italian authorities say over 4,000 migrants have been saved from the Mediterranean in twenty-four hours and 17 migrants have been found dead on a boat. REUTERS/Antonio Parrinello 

Migrants cover themselves with thermal blankets as they stand in line after disembarking in the Sicilian harbour of Augusta, Italy, May 30, 2015. Close to 1,000 migrants rescued in on-going operations are brought safely to port in Sicily as Italian authorities say over 4,000 migrants have been saved from the Mediterranean in twenty-four hours and 17 migrants have been found dead on a boat. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

Migrants cover themselves with thermal blankets as they stand in line after disembarking in the Sicilian harbour of Augusta, Italy, May 30, 2015. Close to 1,000 migrants rescued in on-going operations are brought safely to port in Sicily as Italian authorities say over 4,000 migrants have been saved from the Mediterranean in twenty-four hours and 17 migrants have been found dead on a boat. REUTERS/Antonio Parrinello

Migrants wait to disembark from the Migrant Offshore Aid Station (MOAS) ship MV Phoenix in the Sicilian harbour of Messina, Italy May 16, 2015. REUTERS/Antonio Parrinello 

Migrants are helped after they disembarked from the Migrant Offshore Aid Station (MOAS) ship MV Phoenix in the Sicilian harbour of Messina, Italy May 16, 2015. REUTERS/Antonio Parrinello 

Migrants are helped after they disembarked from the Migrant Offshore Aid Station (MOAS) ship MV Phoenix in the Sicilian harbour of Messina, Italy May 16, 2015. REUTERS/Antonio Parrinello 

A migrant waits to disembark from the Migrant Offshore Aid Station (MOAS) ship MV Phoenix in the Sicilian harbour of Messina, Italy May 16, 2015. REUTERS/Antonio Parrinello 

Migrants wait to disembark from the Migrant Offshore Aid Station (MOAS) ship MV Phoenix in the Sicilian harbour of Messina, Italy May 16, 2015. REUTERS/Antonio Parrinello 

A group of 300 sub-Saharan Africans (bottom) sit on board the Italian Finance Police vessel Di Bartolo as their boat (Top) is left to adrift off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY

A boy, part of group of 300 sub-Saharan Africans, sit in a boat during a rescue operation by the Italian Finance Police vessel Di Bartolo (not pictured) off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police. REUTERS/Alessandro Bianchi 

A group of 300 sub-Saharan Africans sit in board a boat during a rescue operation by the Italian Finance Police vessel Di Bartolo (not pictured) off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

A migrant (R), part of a group of 300 sub-Saharan Africans, looks out from a manhole on a boat during a rescue operation by the Italian Finance Police vessel Di Bartolo off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

A group of 300 sub-Saharan Africans board during a rescue operation by the Italian Finance Police vessel Di Bartolo off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police. REUTERS/Alessandro Bianchi 

A group of 300 sub-Saharan Africans, sit aboard the Italian Finance Police vessel Di Bartolo during a rescue operation off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

A hand of a migrant (C), part of a group of 300 sub-Saharan Africans, is seen from a manhole in a boat during a rescue operation by the Italian Finance Police vessel Di Bartolo off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

A group of 300 sub-Saharan Africans, sit aboard the Italian Finance Police vessel Di Bartolo during a rescue operation off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

Children, part of a group of 300 sub-Saharan Africans, are helped to board by the military of the Italian Finance Police vessel Di Bartolo during a rescue operation off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi 

A group of 300 sub-Saharan Africans on board a boat are seen next to an Italian marine ship (top) during a rescue operation by the Italian Finance Police vessel Di Bartolo (not pictured) off the coast of Sicily, May 14, 2015. Around 1100 migrants were rescued off the coast of Sicily, about 130 miles from Lampedusa, according to the police.
REUTERS/Alessandro Bianchi