A woman is silhouetted against a fountain at a park in Gelsenkirchen, Germany, on Monday, May, 18, 2015 (Photo: AP)
A model wears a floral head dress as she promotes a chain of garden centres at the Royal Horticultural Soceity's Chelsea Flower Show in London, Britain, May 18, 2015 (Photo: Reuters)
An Afghan nomad carries water on donkeys toward her tent on the outskirts of Kabul, Afghanistan, Monday, May, 18, 2015 (Photo: AP)
A Hindu priest holds an oil lamp as he prays during a ritual known as Aarti on the occasion of Somvati Amavasya on the banks of the Ganges river in Allahabad, India, May 18, 2015 (Photo: Reuters)
A boy carries goods on top of his head near soldiers during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi, May 18, 2015 (Photo: Reuters)
U.S. soldiers participate with special operations forces from Pakistan, Jordan, France and the U.S. in a boarding drill during Exercise Eager Lion in the coastal city of Aqaba (AP)
Workers listen to union leaders while standing at the main entrance of the Volvo do Brasil plant in Curitiba, Brazil (Reuters)
Female protesters walk on a street in Bujumbura, Burundi (Reuters)
Rohingya migrants sleep inside a shelter in Kuala Langsa, in Indonesia's Aceh Province (Reuters)
Supporters of pro-Kurdish Peoples' Democratic Party (HDP) shout slogans during a protest against attacks on their party offices, in central Istanbul (Reuters)