Festival-goers brave the changeable weather conditions on day three of the Glastonbury Festival of Music and Performing Arts on Worthy Farm near the village of Pilton in Somerset, South West England on June 24, 2016. / AFP PHOTO / Andy BuchananANDY BUCHANAN/AFP/Getty Images

Festival-goers brave the changeable weather conditions on day three of the Glastonbury Festival of Music and Performing Arts on Worthy Farm near the village of Pilton in Somerset, South West England on June 24, 2016. / AFP PHOTO / Andy BuchananANDY BUCHANAN/AFP/Getty Images

Festival-goers brave the changeable weather conditions on day three of the Glastonbury Festival of Music and Performing Arts on Worthy Farm near the village of Pilton in Somerset, South West England on June 24, 2016. / AFP PHOTO / Andy BuchananANDY BUCHANAN/AFP/Getty Images

This handout picture released by the Italian Navy (Marina Militare) shows a rescue operation of migrants and refugees at sea, off the coast of Libya, on June 23, 2016. Some 5,000 migrants were rescued from rubber dinghies in the Mediterranean on June 23, 2016, the Italian coastguard said, averting another potential high seas disaster. A coastguard spokesman said it appeared many people had left the Libyan coast to attempt the perilous voyage across the sea to Europe during a spell of good weather. / AFP PHOTO / MARINA MILITARE AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MARINA MILITARE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

This handout picture released by the Italian Navy (Marina Militare) shows a rescue operation of migrants and refugees at sea, off the coast of Libya, on June 23, 2016. Some 5,000 migrants were rescued from rubber dinghies in the Mediterranean on June 23, 2016, the Italian coastguard said, averting another potential high seas disaster. A coastguard spokesman said it appeared many people had left the Libyan coast to attempt the perilous voyage across the sea to Europe during a spell of good weather. / AFP PHOTO / MARINA MILITARE AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MARINA MILITARE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

This handout picture released by the Italian Navy (Marina Militare) shows a rescue operation of migrants and refugees at sea, off the coast of Libya, on June 23, 2016. Some 5,000 migrants were rescued from rubber dinghies in the Mediterranean on June 23, 2016, the Italian coastguard said, averting another potential high seas disaster. A coastguard spokesman said it appeared many people had left the Libyan coast to attempt the perilous voyage across the sea to Europe during a spell of good weather. / AFP PHOTO / MARINA MILITARE AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MARINA MILITARE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

This handout picture released by the Italian Navy (Marina Militare) shows a rescue operation of migrants and refugees at sea, off the coast of Libya, on June 23, 2016. Some 5,000 migrants were rescued from rubber dinghies in the Mediterranean on June 23, 2016, the Italian coastguard said, averting another potential high seas disaster. A coastguard spokesman said it appeared many people had left the Libyan coast to attempt the perilous voyage across the sea to Europe during a spell of good weather. / AFP PHOTO / MARINA MILITARE AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MARINA MILITARE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

This handout picture released by the Italian Navy (Marina Militare) shows a rescue operation of migrants and refugees at sea, off the coast of Libya, on June 23, 2016. Some 5,000 migrants were rescued from rubber dinghies in the Mediterranean on June 23, 2016, the Italian coastguard said, averting another potential high seas disaster. A coastguard spokesman said it appeared many people had left the Libyan coast to attempt the perilous voyage across the sea to Europe during a spell of good weather. / AFP PHOTO / MARINA MILITARE AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MARINA MILITARE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images