Boys chat as they arrive with migrants at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants walk after they arrived at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY

A man embraces his sons as they arrive with migrants at the Sicilian harbor of Augusta April 22, 2015.
REUTERS/Alessandro Bianchi 

Migrants stand on board of Italian Navy ship Chimera before to be disembarked in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

A family of migrants arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants stand on board of Italian Navy ship Chimera before disembarking in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants stand on board Italian Navy ship Chimera before disembarking in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants prepare to disembark as they arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants are escorted by Italian Police Finance Guard (R) after they arrived at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Women gesture as they arrive with migrants at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants walk after they arrived at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

A family of migrants arrives at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

A migrant waves as they arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants disembark from the Italian Navy ship Chimera in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

A woman gives milk to her son as she arrives with others migrans at the Sicilian harbor of Augusta April 22, 2015.
REUTERS/Alessandro Bianchi 

Migrants stand on board of Italian Navy ship Chimera before to be disembarked in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants stand under a tent after disembarking from the Italian Navy ship Chimera in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants arrive on the Italian Marines ship Comandante Bettica at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrants stand on board Italian Navy ship Chimera before disembarking in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants arrive at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi 

Migrans walks after they arrived at the Sicilian harbor of Augusta April 22, 2015.
REUTERS/Alessandro Bianchi 

A migrant sits after been disembarking from the Italian Navy ship Chimera in the southern harbour of Salerno April 22, 2015. The European Union must take a collective stand to tackle migrant trafficking at its source in African countries, Italy's Prime Minister Matteo Renzi said on Wednesday ahead of an emergency summit of the bloc's leaders to discuss the crisis. Renzi spoke as Italian navy and coast guard vessels were taking more than 1,200 migrants rescued in other operations since Monday to ports across southern Italy. One ship carrying 545 migrants, including 174 women and children, was heading to Salerno, on the mainland south of Naples, to ease the strain on overcrowded centres receiving migrants in ports in Sicily. REUTERS/Ciro De Luca

Migrants are escorted by Italian Police Finance Guard (R) after they arrived at the Sicilian harbor of Augusta April 22, 2015. REUTERS/Alessandro Bianchi