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By Reuters -

Smoke and lava spew from the Villarrica volcano, as seen from Pucon town, in the south of Santiago, Chile, April 22, 2015. Authorities have restricted access to the area within 5 kilometres (3 miles) of the crater and have put the area under an orange alert due to the volcano's heightened unrest and increased likelihood of eruption. REUTERS/Cristobal Saavedra

A foreign man bathes on a sports field adjacent to a camp for those affected by anti-immigrant violence in Chatsworth north of Durban, South Africa April 21, 2015. South Africa deployed the army on Tuesday in "volatile areas" to curb a wave of anti-immigrant violence that has killed at least seven people this month, the defense minister said. The latest wave of anti-immigrant attacks began almost three weeks ago in parts of the coastal city of Durban in Kwa-Zulu Natal and quickly spread to Johannesburg, South Africa's commercial capital. REUTERS/Rogan Ward

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

Flowers float on the sea's surface after schoolchildren and teachers from St Theresa College Primary School threw flowers into the sea during a memorial service for migrant victims in Msida, outside Valletta, April 22, 2015. Italian Prime Minister Matteo Renzi said on Wednesday it was fundamental the European Union take a collective stand to tackle migrant trafficking at its source in African countries, days after hundreds died in the latest Mediterranean disaster. REUTERS/Darrin Zammit Lupi

A bird spreads its wings along the Anhinga Trail at Everglades National Park, Florida April 22, 2015. REUTERS/Jonathan Ernst

People, some wrapping Israeli flags around themselves, watch as fireworks explode from the roof of the Tel Aviv city hall during celebrations for Israel's Independence Day, marking the 67th anniversary of the creation of the state, April 22, 2015.REUTERS/Baz Ratner

People place candles on the shoreline rocks as they take part in a vigil to commemorate migrants who died at sea in Sliema, outside Valletta, April 22, 2015. European Union leaders who decided last year to halt the rescue of migrants trying to cross the Mediterranean will reverse their decision on Thursday at a summit hastily convened after nearly 2,000 people died at sea. Public outrage over the deaths peaked this week after up to 900 migrants died last Sunday when their boat sank on its way to Europe from Libya. REUTERS/Darrin Zammit Lupi

President Obama takes a walking tour of the Anhinga Trail at Everglades National Park, Florida April 22, 2015. Obama is visiting the subtropical swamps of the park as part of a push to get Americans thinking and talking about the damage climate change is causing close to home. REUTERS/Jonathan Ernst

Zhu Roumeng kisses with her pet pig Wuhua at her house in Beijing April 22, 2015. Zhu has raised the female pig, which weighs around 85 kilogram, for the last three and a half years, and they've recently become an internet sensation after she posted her selfies with her pet pig on China's microblogging sites. Her surname 'Zhu' sounds exactly like the Mandarin word for 'pig', as such it sparked her love of pigs as a child, Zhu said. REUTERS/Kim Kyung-Hoon

Chechen soldiers, representing Russia and wearing uniforms stitched with Chechen flags, compete in the 7th Annual Warrior Competition at the King Abdullah Special Operations Training Center in Amman, Jordan April 22, 2015. REUTERS/Muhammad Hamed

Sandra Bullock has been named People Magazine's most beautiful woman in the world. REUTERS/Andrew Winning

An alligator suns itself along the Anhinga Trail at Everglades National Park, Florida April 22, 2015. REUTERS/Jonathan Ernst

Chechen soldiers, representing Russia and wearing uniforms stitched with Chechen flags, compete in the 7th Annual Warrior Competition at the King Abdullah Special Operations Training Center in Amman, Jordan April 22, 2015. REUTERS/Muhammad Hamed

Pro-democracy lawmakers Raymond Chan (2nd R) chants slogans as he and Albert Chan (R), carrying yellow umbrellas, a symbol of the Occupy Central movement, leave to boycott Hong Kong Chief Secretary Carrie Lam during a Legislative Council meeting in Hong Kong April 22, 2015. The Hong Kong government unveiled a long-awaited electoral blueprint for selecting the city's next leader to lawmakers on Wednesday, in a plan that reflected China's desire for a tightly controlled poll that is likely to rile democracy activists. The banner in the background reads "Say no to fake universal suffrage". REUTERS/Bobby Yip

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

German Chancellor Angela Merkel looks at technical experiment created by students, during a Girls Day career event at the Chancellery in Berlin, Germany April 22, 2015. Girls Day seeks to attract female pupils to careers in IT, technological and natural science sectors of the German industry. REUTERS/Fabrizio Bensch

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

A surfer waits for a break in crashing waves before diving in for a surf off Sydney's Collaroy Beach, Australia April 22, 2015. A cyclonic storm lashed Australia's east coast for a third day on Wednesday, causing millions of dollars of damage to property and infrastructure in Sydney and other cities. REUTERS/Jason Reed

An Israeli soldier checks his mobile phone as he stands at the Mount Herzl military cemetery during a Memorial Day in Jerusalem April 22, 2015. REUTERS/Ammar Awad

Zhu Roumeng walks with her pet pig, Wuhua, near her house in Beijing, China April 22, 2015. Zhu has raised the female pig, which weighs around 85 kilogram, for the last three and a half years, and they've recently become an internet sensation after she posted her selfies with her pet pig on China's microblogging sites. Her surname 'Zhu' sounds exactly like the Mandarin word for 'pig', as such it became the reason for her love of pigs since she was a child, Zhu said. REUTERS/Kim Kyung-Hoon

A woman places a rose on a memorial wall, engraved with names of fallen soldiers from the armored corps, before a Memorial Day ceremony in Latrun near Jerusalem, Israel April 22, 2015. Israel on Wednesday marks Memorial Day to commemorate its fallen soldiers. REUTERS/Baz Ratner