April 18, 2016

The Villarrica Volcano is seen at night in Chile. Villarrica is one of Chile's most active volcanoes.

A depiction of a gas mask placed by environmental protest group Greenpeace is seen on a statue of Britain's Queen Victoria near Buckingham Palace in London, Britain.

Migrants ask for help from a dinghy boat as they are approached by the SOS Meditrranee's ship Aquarius, background, off the coast of the Italian island of Lampedusa, April 17, 2016. The European Union's border agency says the number of migrants crossing the Mediterranean Sea to Italy more than doubled last month.

Marcel Hug, of Switzerland, breaks the tape ahead of Kurt Fearnley, of Australia, center, and Ernst Van Dyk, of South Africa, in the wheelchair division of the 120th Boston Marathon in Boston, Massachusetts, USA.

Alberto Lopez, right, helps his wife Glenda wade through floodwaters as they evacuate their flooded apartment complex in Houston, Texas. Storms have dumped more than a foot of rain in the Houston area, flooding dozens of neighborhoods and forcing the closure of city offices and the suspension of public transit.

A South Korean worker cleans a statue of Adm. Yi Sun-sin ahead of the coming of spring at Gwanghwamun Plaza in Seoul.

A man cools off in a stream during hot weather in Islamabad, Pakistan.

Wild bluebells, which bloom around mid-April, turning the forest completely blue, form a carpet in the Hallerbos, also known as the "Blue Forest", near the Belgian city of Halle.

A migrant holds a banner reading "Your silence killing us " during a demonstration on a rail tracks at the northern Greek border point of Idomeni, Greece.

A view of a flooded commercial center in Santiago, Chile, April 17, 2016.

Girls perform yoga at a tea plantation as a part of TV program selecting members for a female performance group in Hangzhou, Zhejiang Province, China, April 17, 2016.

Oil pour into the the Polcevera stream that connects the port of Genoa with the Po Valley, Italy, after a pipeline belonging to the oil plant of 'Iplolm' ruptured.

Two boats lie on cracked ground in a dry area in Ca Mau province, Vietnam. Vietnam is facing the most serious drought in the last 90 years, according to a statement by the Ministry of Agriculture and Rural Development.

Lightning illuminates the night sky during a storm over Guwahati, India.