Italian police (R) photograph a child after migrants arrived via boat at the Sicilian harbor of Pozzallo April 19, 2015.
REUTERS/Alessandro Bianchi

A child (C) is carried into bus as migrants arrive via boat at the Sicilian harbor of Pozzallo April 20, 2015.
REUTERS/Alessandro Bianchi

A child is carried by a rescue worker (R) as he arrives with migrants on the boat at the Sicilian harbor of Pozzallo April 19, 2015.
REUTERS/Alessandro Bianchi
TPX IMAGES OF THE DAY

A child looks on as he arrives with migrants on a boat at the Sicilian harbor of Pozzallo April 19, 2015. REUTERS/Alessandro Bianchi
TPX IMAGES OF THE DAY

Migrants arrive on a boat at the Sicilian harbor of Pozzallo April 20, 2015.
REUTERS/Alessandro Bianchi

Migrants arrive on the boat at the Sicilian harbor of Pozzallo April 19, 2015.
REUTERS/Alessandro Bianchi

Children are carried by rescue workers as migrants arrive via boat at the Sicilian harbor of Pozzallo April 19, 2015.
REUTERS/Alessandro Bianchi

Children look out from a bus after arriving with migrants via boat at the Sicilian harbor of Pozzallo April 20, 2015.
REUTERS/Alessandro Bianchi

Migrants rest after they disembarked from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

A migrant looks on after disembarking from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

A migrant wait to disembarks from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants wait to disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

A migrant waits to disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants wait to disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen" which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Migrants wait to disembark from a tug boat in the Sicilian harbour of Trapani, April 17, 2015. According to local media reports, the migrants were rescued in the Strait of Sicily by a merchant ship "Maersk Ellen", which was sailing under the Danish flag, assisting in the rescue operation. REUTERS/Guglielmo Mangiapane 

Adolescent migrants argue during a protest in a courtyard at an immigration centre in Caltagirone, Sicily March 18, 2015. The migrants claim they are staying in the centre longer than a duration of three months, as promised to them. The number of migrants reaching Italy by sea this year is set to top last year's record of 170,000, the International Organization for Migration (IOM) said. In the past week alone 10,000 have arrived. Another 400 people drowned before making it to Italy's shores, survivors said. The number of minors traveling alone in this mass migration has soared -- underage arrivals to Italy tripled in 2014 from the previous year. Picture taken March 18, 2015. To match Insight ITALY-MIGRANTS/BOYS REUTERS/Alessandro Bianchi 

Migrants are disembarked from a Coast Guard boat in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants are disembarked from a Coast Guard boat in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants rest after they disembarked in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants wait before disembarking from a Coast Guard boat in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

A migrant is photographed during the identification procedure after he disembarked in the Sicilian harbour of Palermo, April 15, 2015. Some 480 migrants arrived on Wednesday in Sicily's Palermo, including several pregnant women, bringing the number of arrivals at the port to around 1,500 in the last 24 hours. REUTERS/Guglielmo Mangiapane 

A migrant is helped as he disembarks from a Coast Guard boat in the Sicilian harbour of Palermo, April 15, 2015. Some 480 migrants arrived on Wednesday in Sicily's Palermo, including several pregnant women, bringing the number of arrivals at the port to around 1,500 in the last 24 hours. REUTERS/Guglielmo Mangiapane 

Migrants wait before disembarking from a Coast Guard boat as they arrive in the Sicilian harbour of Palermo, April 15, 2015. Some 480 migrants arrived on Wednesday in Sicily's Palermo, including several pregnant women, bringing the number of arrivals at the port to around 1,500 in the last 24 hours. REUTERS/Guglielmo Mangiapane 

A Red Cross nurse carries a baby from a merchant ship in the Sicilian harbour of Palermo, April 15, 2015. Some 480 migrants arrived on Wednesday in Sicily's Palermo, including several pregnant women, bringing the number of arrivals at the port to around 1,500 in the last 24 hours, local media reported. REUTERS/Guglielmo Mangiapane 

Migrants wait before disembarking from a merchant ship, as they arrive in the Sicilian harbour of Palermo, April 15, 2015. Some 480 migrants arrived on Wednesday in Sicily's Palermo, including several pregnant women, bringing the number of arrivals at the port to around 1,500 in the last 24 hours. REUTERS/Guglielmo Mangiapane 

Migrants are disembarked from a merchant ship as they arrive in the Sicilian harbour of Palermo April 15, 2015. A baby was among a group of 480 migrant men and women that arrived at the Port of Palermo on Wednesday on three different boats, local media reported. REUTERS/Guglielmo Mangiapane.

Migrants rest after they disembarked in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants rest after they disembarked in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants rest after they disembarked in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello 

Migrants rest after they disembarked in the Sicilian harbour of Augusta, April 16, 2015. Italian police arrested 15 African men suspected of throwing about a dozen Christians from a migrant boat in the Mediterranean on Thursday, as the crisis off southern Italy intensified. REUTERS/Antonio Parrinello