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By Reuters -

Police officers stand guard while a protester speaks on her mobile phone in front of a Macedonian government building in Skopje, Macedonia, May 6, 2015. REUTERS/Ognen Teofilovski

Reservoir banks that used to be underwater are seen at Millerton Lake, on the San Joaquin River, in Friant, California, United States May 6, 2015. California's snowpack, which generally provides about a third of the state's water, is at its lowest level on record. REUTERS/Lucy Nicholson

The unmanned SpaceX Crew Dragon lifts off from launch pad 40 during a Pad Abort Test at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, May 6, 2015. REUTERS/Scott Audette

Ghazal, 4, (L) and Judy, 7, carrying 8-month-old Suhair, react after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad near the Syrian Arab Red Crescent center in the Douma neighborhood of Damascus May 6, 2015. The shelling happened during the visit by a Syrian Arab Red Crescent convoy to deliver medical aid to their center in Douma, activists aid. REUTERS/Bassam Khabieh

Ultra-Orthodox Jews gather near a bonfire as they celebrate the Jewish holiday of Lag Ba'Omer in Bnei Brak May 6, 2015. The holiday, which marks the end of a plague in the Middle Ages that killed thousands of disciples of a revered rabbi in the holy land, is celebrated by lighting bonfires across the country. REUTERS/Baz Ratner

Cows are seen at Harris Cattle Ranch in Coalinga in the Central Valley, California, United States May 6, 2015. It takes 150 gallons of water to make a 1/3 pounder hamburger according to the U.S. Geological Survey. REUTERS/Lucy Nicholson

Leader of the United Kingdom Independence Party (UKIP) Nigel Farage speaks to supporters at his final campaign event in Broadstairs, southeast England, May 6, 2015. REUTERS/Suzanne Plunkett

Ultra-Orthodox Jewish children hold cardboard in front of their faces as they watch bonfires during celebrations for the Jewish holiday of Lag Ba'Omer in Bnei Brak May 6, 2015. REUTERS/Baz Ratner

A boy jumps into the Ganges river to cool off himself on a hot summer day in Kolkata, India, May 6, 2015. REUTERS/Rupak De Chowdhuri

Medical clowns perform in front of children affected by the April 25 earthquake in Kathmandu May 6, 2015. A team of five medical clowns from Israel is visiting earthquake victims to ease trauma effects and to reduce pain and anxiety among children and adults in communities and hospitals via their clowning skills. REUTERS/Navesh Chitrakar

A woman paddles in a makeshift boat as she collects recyclable trash from a polluted river in Navotas city, Philippines May 6, 2015. REUTERS/Ezra Acayan

Nepal army personnel and earthquake survivors search for belongings at a collapsed house in Sankhu on the outskirts of Kathmandu, Nepal May 6, 2015. REUTERS/Adnan Abidi

Four Afghan men look on in court during their trial in connection with the killing of a 27-year-old woman, in Kabul, Afghanistan May 6, 2015. An Afghan judge sentenced the four men to death on Wednesday for the mob killing of a 27-year-old woman accused of burning a Koran in Kabul, a case that sparked outrage and street protests in the city. The four were among 49 defendants, 19 of them police officers, on trial in connection with the killing. REUTERS/Mohammad Ismail

Israeli border policemen move a Palestinian man away from a bulldozer as Israeli forces bulldoze a farmland in Soba village near the West Bank city of Hebron May 6, 2015. Palestinians said they were informed by the Israeli army that they do not have the needed Israeli-issued permission to own lands there. REUTERS/Mussa Qawasma

A boy, in mourning for a family member, rescues a CD from his home destroyed by the April 25 earthquake in Bhaktapur, Nepal, May 6, 2015. REUTERS/Olivia Harris

A palace guard stands at the gate to Gyeongbokgung Palace in Seoul, South Korea May 6, 2015. REUTERS/Thomas Peter

Singer Elton John, founder of the Elton John AIDS Foundation, and Doctor Rick Warren react as they arrive to testify before a Senate Appropriations State, Foreign Operations and Related Programs Subcommittee hearing on global health problems in Washington May 6, 2015. REUTERS/Carlos Barria

People watch a shadow play performance at Changgyeonggung Palace in Seoul, South Korea May 6, 2015. REUTERS/Thomas Peter