Thousands of mourners attend a rally to commemorate the first anniversary of the Sewol ferry disaster that killed more than 300 passengers, in central Seoul April 16, 2015 (Photo: Reuters)
A Palestinian protester throws back a tear gas canister that was fired by Israeli troops during clashes following a protest marking Palestinian "Prisoners' Day", outside Ofer military prison near the West Bank city of Ramallah. Thursday, April 16, 2015 (Photo: AP)
Sudanese fishermen wash their day's catch by the Nile River bank at dawn, after an overnight fishing trip, in Khartoum, Sudan, Thursday, April 16, 2015 (Photo: AP)
A view of the paddock at sunset ahead of the Bahrain Formula One Grand Prix at the Formula One Bahrain International Circuit in Sakhir, Bahrain, Thursday, April 16, 2015. The Bahrain Formula One Grand Prix will take place here on Sunday (Photo: AP)
A lone tulip sprouts up in a field of blossoming hyacinths near Lisse, Netherlands, Thursday, April 16, 2015. Flowers are left to blossom in the field to harvest the bulbs, one of the country's well known export products (Photo: AP)
A tourist takes pictures in a field of blossoming tulips near Lisse, Netherlands, Thursday, April 16, 2015. Flowers are left to blossom in the field to harvest the bulbs, one of the country's well known export products (Photo: AP)
A couple rests under blossoming trees during a spring sunny day at Petrin Hill in the Czech capital Prague April 16, 2015 (Photo: Reuters)
A Brazilian Indian from an indigenous ethnic group reacts at the Chamber of Deputies during a solemn session on the National Indigenous Day in Brasilia April 16, 2015 (Photo: Reuters)
Members of the U.S. 2nd Battalion, 7th Infantry Regiment, 1st Brigade Combat Team, 3rd Infantry Division ride the Abrams tank during an exercise at Mielno range near Drawsko-Pomorskie April 16, 2015 (Photo: Reuters)
A Yemeni man, background, uses his mobile to take photos of Shiite rebels, known as Houthis, holding up their weapons during a demonstration against an arms embargo imposed by the U.N. Security Council on Houthi leaders, in Sanaa, Yemen, Thursday, April 16, 2015 (Photo: AP)
A model presents a creation by Kazakhstan's AVOLI design house during Kazakhstan Fashion Week in Almaty April 16, 2015 (Photo: Reuters)
Dancers of Joburg Ballet and the Liaoning Ballet of China company take part in a final dress rehearsal, Thursday, April 16, 2015 ahead of a two week run of performances of "Swan Lake" which gets under way at the Joburg Theater Friday (Photo: AP)
Baby clouded leopards, born early in March 2015 are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015 (Photo: Reuters)
Palestinians protesters prepare to throw stones towards Israeli troops during clashes following a protest marking Palestinian "Prisoners' Day", outside Ofer military prison near the West Bank city of Ramallah. Thursday, April 16, 2015 (Photo: AP)