Marcella Richardson (L) and Joi Cole take their photograph in front of a poster of Democratic presidential candidate Hillary Clinton before Clinton addresses the 61st Annual NAACP “Fight For Freedom Fund Dinner” in Detroit, Michigan May 1, 2016. (Photo by Rebecca Cook/Reuters)





In this Sunday May 4, 2014 file photo, a man lays flowers inside the burnt trade union building in Odessa, Ukraine. Demonstrators have gathered in the Ukrainian city of Odessa to mark the second anniversary of the street clashes that culminated in a fire that killed 43 people as they took shelter from opponents. (Photo by Sergei Poliakov/AP Photo)





Women check their cell phones as they walk on the sidewalk in Sao Paulo, Brazil, Monday, May 2, 2016. A Brazilian judge investigating a drug ring has ordered cell phone operators to block the messaging app WhatsApp for 72 hours. (Photo by Andre Penner/AP Photo)





A man lies in the street after being struck in the face by an object during anti-capitalist protests following May Day marches in Seattle, Washington, U.S. May 1, 2016. (Photo by David Ryder/Reuters)





Tennis, Madrid Open, Agnieszka Radwanska of Poland v Dominika Cibulkova of Slovakia, Madrid, Spain on May 1, 2016. Radwanska waits for umpire's call on a ball. (Photo by Susana Vera/Reuters)





People march with posters against Republican presidential candidate Donald Trump during an immigrant rights May Day rally in Los Angeles, California, U.S., May 1, 2016. (Photo by Lucy Nicholson/Reuters)





A man fishes on the bank of the Yenisei river during a snowfall in the Siberian town of Divnogorsk, Russia, May 2, 2016. (Photo by Ilya Naymushin/Reuters)





Non-disabled visitors compete as they experience wheelchair basketball during the “No Limits Challenge” event promoting Japan's paralympic teams of athletes ahead of the Rio 2016 Paralympic Games in the Ginza shopping district in Tokyo, Japan, May 2, 2016. (Photo by Thomas Peter/Reuters)





Shi'ite pilgrims make their way to Kadhimiya to mark the death of Imam Moussa al-Kadhim, in Baghdad, Iraq May 2, 2016. (Photo by Khalid al Mousily/Reuters)





Orthodox Christian worshippers carry an icon of the Virgin Mary during a parade marking Easter near Bachkovo monastery, Bulgaria, May 2, 2016. (Photo by Stoyan Nenov/Reuters)





Visitors of the “re:publica” conference, about digital culture in the world, try out virtual reality headsets at the booth of German ZDF public TV broadcaster in Berlin, Germany, May 2, 2016. (Photo by Fabrizio Bensch/Reuters)





Journalists and fans meet Sandhja (L) of Finland (Sing it away) in the press room at the Globe Arena ahead of the Eurovision Song Contest 2016 in Stockholm, Sweden, May 2, 2016. (Photo by Henrik Montgomery/Reuters/TT News Agency)





A man with his face and body painted with red colour gestures as they during a rally in solidarity with the people of Aleppo in front of the Brandenburg Gate in Berlin, Germany, May 2, 2016. (Photo by Fabrizio Bensch/Reuters)





A man draws a spiral in exposed sand next to the River Thames during low tide, near the South Bank in London, Britain May 2, 2016. (Photo by Neil Hall/Reuters)





A man walks away after drawing a spiral in exposed sand next to the River Thames during low tide, near the South Bank in London, Britain May 2, 2016. (Photo by Neil Hall/Reuters)





Members of the guard of honour prepare for a visit of German Defence Minister von der Leyen in Vienna, Austria, May 2, 2016. (Photo by Leonhard Foeger/Reuters)





Cubans watch as the first US-to-Cuba cruise ship to arrive in the island nation in decades glides into the port of Havana, on May 2, 2016. The first US cruise ship bound for Cuba in half a century, the Adonia – a vessel from the Carnival cruise's Fathom line – set sail from Florida on Sunday, marking a new milestone in the rapprochement between Washington and Havana. The ship – with 700 passengers aboard – departed from Miami, the heart of the Cuban diaspora in the United States. (Photo by Adalberto Roque/AFP Photo)





People with Cuban and U.S. flags look at the arrival of U.S. Carnival cruise ship Adonia at the Havana bay, the first cruise liner to sail between the United States and Cuba since Cuba's 1959 revolution, Cuba, May 2, 2016. (Photo by Reuters/Stringer)





A woman feeds a child next to rail tracks at a migrants and refugees makeshift camp at the Greek-Macedonian border near the village of Idomeni on May 2, 2016. Some 54,000 people, many of them fleeing the war in Syria, have been stranded on Greek territory since the closure of the migrant route through the Balkans in February. (Photo by Tobias Schwarz/AFP Photo)





Ukrainians pour water on each other on a street in Lviv, Ukraine, 02 May 2016. The tradition of pouring water was an ancient spring ritual of cleansing on first Monday after Orthodox Easter. (Photo by Mykola Tys/EPA)





A firefighter is rinsed off at the scene of a fire at the Annunciation of Our Lady Greek Orthodox Church in Melbourne, Australia, 02 May 2016. According to reports, some 200 people were evacuated from nearby buildings during the incident. The fire was under control within an hour, media added. (Photo by Julian Smith/EPA)





Masked protesters clash with riot police after a demonstration against the French Government's labor law reform bill in Paris, France, 01 May 2016. This march takes place in an atmosphere of massive protest again French labor reform project which will be discussed at the French Parliament on 03 May. (Photo by Christophe Petit Tesson/EPA)





The cows “Elan” (L) and “Sauvage” (R) ram their heads during the traditional annual “Combats de Reines” (Battle of the Queens), a cow fight in Aproz, western Alpine canton of Valais, Switzerland, 01 May 2016. Each year, the cows test their strength and fight for the herd's leadership when taken to the alpine pastures. The competition continues until a new queen has forced all the other cows to retreat. (Photo by Olivier Maire/EPA)





A doll of Democratic presidential candidate Hillary Clinton is seen in the back pocket of a person as he waits for her to make a campaign stop at the Douglass Park Gynasium on May 1, 2016 in Indianapolis, Indiana. Presidential candidates continue to campaign across the state leading up to Indiana's primary day on May 3. (Photo by Joe Raedle/Getty Images)





A view of the atmosphere at BritWeek's 10th Anniversary VIP Reception & Gala at Fairmont Hotel on May 1, 2016 in Los Angeles, California. (Photo by Angela Weiss/Getty Images for BritWeek)





Workers inspect rows of tulips at the Degenhardt-Sellmann Spezialkulturen tulip fields near Magdeburg on May 2, 2016 in Schwaneberg, Germany.The company cultivates up to 10 different strains of tulips on 40 hectares of land to harvest not the flowers but the bulbs. (Photo by Sean Gallup/Getty Images)





Jose Lagunas and Caitlyn Baidas join immigration rights protesters during a May Day rally outside the Immigration and Customs Enforcement (ICE) detention center in Los Angeles, California on May 1, 2016. (Photo by Mark Ralston/AFP Photo)





South Korean young novice monks stand under lotus lanterns after having their heads shaved during a ceremony entitled “Children Becoming Buddhist Monks”, at the Jogye temple in Seoul on May 2, 2016. Following the ceremony the children stay at the temple where they are taught about Buddhism, for two weeks, until Buddha's birthday on May 14. (Photo by Jung Yeon-Je/AFP Photo)





Spectators gather on the Andy Warhol bridge over the Allegheny River in downtown Pittsburgh to watch the over 35,000 runners participating in the 2016 Pittsburgh Marathon and 1/2 Marathon, May 1, 2016. (Photo by Gene J. Puskar/AP Photo)





A child drinks water from a pipe on the platform of a trim station which was turned into a makeshift camp crowded by migrants and refugees at the northern Greek border point of Idomeni, Greece, Monday, May 2, 2016. Many thousands of migrants remain at the Greek border with Macedonia, hoping that the border crossing will reopen, allowing them to move north into central Europe. (Photo by Gregorio Borgia/AP Photo)





Visitors take photographs next to the still-smouldering pyres of more than 100 tons of elephant tusks and over 1 ton of rhino horns, in Nairobi National Park, Kenya Monday, May 2, 2016. Kenyan and international visitors came on Monday to view the pyres of ivory, believed to be the largest stockpile ever destroyed, after it was set on fire Saturday in a dramatic statement against the trade in ivory and products from endangered species. (Photo by Ben Curtis/AP Photo)





The artist's impression provided by European Southern Observatory on May 2, 2016 shows an imagined view from the surface one of the three planets orbiting an ultracool dwarf star just 40 light-years from earth that were discovered using the TRAPPIST telescope at ESO's La Silla Observatory. It's the first time planets have been found around this type of star – and it opens up new, rich territory in the search for extraterrestrial life. Because this star is so close and so faint, astronomers can study the atmospheres of these three temperate exoplanets and, eventually, hunt for signs of possible life. (Photo by M. Kornmesser/ESO via AP)





This artist's impression shows an imagined view of the three planets orbiting an ultracool dwarf star just 40 light-years from Earth that were discovered using a specialist telescope at ESO's La Silla Observatoryin Chile, according to new findings by an international team of astronomers, May 2, 2016. (Photo by M. Kornmesser/N. Risinger/Reuters/ESO)





Firefighters battle a fire at the historic Serbian Orthodox Cathedral of St. Sava, Sunday, May 1, 2016, in New York. The church that was constructed in the early 1850s and was designated a New York City landmark in 1968. (Photo by Kathy Willens/AP Photo)





Plainclothed police officers arrest a man during clashes between anti-riot police and protesters during the traditional May Day demonstration in Paris on May 1, 2016. (Photo by Alain Jocard/AFP Photo)





A woman walks along a small alley in the northwestern Moroccan city of Chefchaouen, in the Rif mountains, on May 1, 2016. According to the latest list of the 50 world's most beautiful cities released by “Conde Nast Traveler”, Chefchaouen ranks sixth among the top ten most beautiful cities, dethroning Paris, which remains in the top 10 in 7th place, followed by Cape Town, South Africa. (Photo by Fadel Senna/AFP Photo)





Juana Medina waves to her daughter and grandchildren through the U.S.-Mexico border fence on May 1, 2016 in Tijuana, Mexico. Medina said her daughter immigrated from Mexico to Tennessee 20 years ago and brought her two children back to the border fence in Tijuana to see their grandmother for the first time. Mexicans on the Tijuana side can approach the border fence, painted with colorful murals, at any time. The U.S. Border Patrol, however, tightly controls the San Diego, CA side and allows visitors to speak to loved ones through the fence during restricted weekend hours at “Friendship Park”. (Photo by John Moore/Getty Images)





The “Batmobile” arrives at the finish line as Gumball Rally closes down Regent Street at Regent Street on May 3, 2016 in London, England. (Photo by Ben A. Pruchnie/Getty Images)





In this May 1, 2016 photo, a man dresses a donkey to resemble Donald Trump in preparation for the costume competition at the annual donkey festival in Otumba, Mexico state, Mexico. The donkey was later adorned with a blond wig and eyebrows. None of the Trump entrants won much favor with the audience at the 51st annual donkey fest. Audience applause chose donkeys emulating a Smurf, a firefighter and an Uber ride for the first top three prizes. (Photo by Rebecca Blackwell/AP Photo)





Aztec dancers lead the annual May Day immigration and workers rights march from Judkins Park to the federal courthouse downtown, Sunday, May 1, 2016, in Seattle. (Photo by Grant Hindsley/Seattlepi.com via AP Photo)