A migrant boy uses a piece of a tent as a kite as he runs in a field near a makeshift camp on the Greek-Macedonian border near the village of Idomeni, Greece March 10, 2016. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

A supporter of Republican U.S. presidential candidate Marco Rubio sits by herself after a campaign rally in Miami, Florida March 9, 2016. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

An honor guard stands over the casket of former first lady Nancy Reagan, wife of former President Ronald Reagan, at the Ronald Reagan Library in Simi Valley, California, March 9, 2016. REUTERS/Jae C. Hong/Pool TPX IMAGES OF THE DAY

A polar bear cub snuggles up against her mother Valeska, in their enclosure at Bremerhaven's (Bremen's) Zoo by the Sea, Germany March 9, 2016. The female cub, who is yet to ne named, was born on December 11 last year. REUTERS/Carmen Jaspersen/Pool TPX IMAGES OF THE DAY

Democratic U.S. presidential candidates Senator Bernie Sanders and Hillary Clinton wave before the start of the Univision News and Washington Post Democratic U.S. presidential candidates debate in Kendall, Florida, March 9, 2016. REUTERS/Javier Galeano TPX IMAGES OF THE DAY

A student offers a heart-shaped paper cutout to a French CRS riot policeman during a demonstration against the French labour law proposal in Lyon, France, as part of nationwide labor reform bill protests by students and union members, March 9, 2016. REUTERS/Robert Pratta TPX IMAGES OF THE DAY

The son of a customs agent (R) mourns the death of his father killed in Monday's attack on army and police posts by Islamist fighters in the town of Ben Guerdane, Tunisia, near the Libyan border March 9, 2016. REUTERS/Zoubeir Souissi TPX IMAGES OF THE DAY

A black demonstrator raises her fist in protest against U.S. Republican presidential candidate Donald Trump as police officers approach to remove her from a campaign rally in Fayetteville, North Carolina March 9, 2016. Trump was interrupted repeatedly by demonstrators during his rally. REUTERS/Jonathan Drake TPX IMAGES OF THE DAY

Students hold geometrical forms to decorate the Freedom School, in the town of al-Tamanah, in the southern countryside of Idlib, Syria March 9, 2016. This school was converted from a poultry farm by the residents of the town more than a year ago. REUTERS/Khalil Ashawi TPX IMAGES OF THE DAY

Israeli border policemen perform a security search on a Palestinian youth at Damascus Gate in Jerusalem's Old City, March 9, 2016. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

The mountain Buachaille Etive Mor is reflected in water near Ballachulish, Scotland, Britain March 9, 2016. REUTERS/Russell Cheyne TPX IMAGES OF THE DAY

Models present creations by Italian designer Giambattista Valli as part of his Fall/Winter 2016/2017 women's ready-to-wear collection for Moncler Gamme Rouge in Paris, France, March 9, 2016. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY

A woman looks through a tent during a gathering by Houthi loyalists against Saudi-led air strikes in Yemen's capital Sanaa March 9, 2016. REUTERS/Khaled Abdullah TPX IMAGES OF THE DAY

A woman sunbathes in front of the flags that circle the Washington Monument on an unseasonably warm day in Washington March 9, 2016. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY

Kimberly Leif of Simi Valley, cries in front of the casket of former first lady Nancy Reagan as she lies in repose at the Reagan Presidential Library in Simi Valley, California March 9, 2016. REUTERS/Wally Skalij/Pool TPX IMAGES OF THE DAY

A migrant boy holds his umbrella while standing in a mud at a makeshift camp on the Greek-Macedonian border, near the village of Idomeni, Greece March 10, 2016. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

A supporter offers a copy of the U.S. Constitution for Republican presidential candidate Donald Trump to autograph at the end of a campaign rally in Fayetteville, North Carolina March 9, 2016. Picture taken March 9, 2016. REUTERS/Jonathan Drake TPX IMAGES OF THE DAY

Palestinian woman Jihan Abu Muhsen rides her donkey-drawn cart as she makes her way to unload bricks that she collected for sale from the sites of demolished buildings in Khan Younis in the southern Gaza Strip March 8, 2016. Abu Muhsen gathers bricks from the sites of demolished buildings and sells them to recycling factories. She earns around 20 shekels ($5) a day and her 10-year-old son Mohammad helps her when he is not at school. REUTERS/Ibraheem Abu Mustafa TPX IMAGES OF THE DAY SEARCH "GAZA BRICK" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.