Firefighters respond to a fire at an auto wrecking yard in the Sun Valley section of Los Angeles in the San Fernando Valley as a huge plume of thick, black smoke rises over them on Sunday, April 17, 2016.

The city Fire Department said the blaze at Self Service Auto Recycler in Sun Valley engulfed at least 15 vehicles.

Lemi Berhanu Hayle, of Ethiopia, celebrates after winning the 120th Boston Marathon on Monday, April 18, 2016.

Alberto Lopez, right, helps his wife Glenda wade through floodwaters as they evacuate their flooded apartment complex Monday, April 18, 2016, in Houston.

Storms 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.

Students from the Lewisburg Elementary School in Olive Branch, Mississippi, observe the House in session at the Capitol in Jackson, Wednesday, April 20, 2016.

A supporter holds a cutout of Democratic presidential candidate Bernie Sanders during "A Future To Believe In GOTV" rally in Brooklyn, New York, April 17, 2016.

Sia performs onstage during day 3 of the 2016 Coachella Valley Music And Arts Festival Weekend 1 at the Empire Polo Club on April 17, 2016 in Indio, California.

Truman Rivera Mindt , age 9, reads a book while he waits for the speech of Democratic Presidential candidate Hillary Clinton April 18th, 2016 at at a "Get Out the Vote" rally April 18th, 2016 in New York ahead of the Democratic primary in New York.

Democratic presidential candidate Hillary Clinton celebrates victory in the New York state primary on April 19, 2016 in New York City.

Clinton won the New York primary, galvanizing her bid to win the Democratic nomination for the White House.

Kenya Wildlife Service (KWS) rangers stack elephant tusks, part of an estimated 105 tonnes of confiscated ivory to be set ablaze, on a pyre at Nairobi National Park near Nairobi, Kenya, April 20, 2016.

Several African heads of state, conservation experts, high-profile philanthropists and celebrities are slated to be present at the event which they hope will send a strong anti-poaching message.

President Barack Obama with First Lady Michelle Obama meets Prince George as the Duke and Duchess of Cambridge watch at Kensington Palace in London, April 22, 2016.

French former overall Ski World Cup winner and race car driver Luc Alphand skiing down a big sand dune during an off-road mapping recognition excercise ahead of the Silk Way Rally 2016 in the Gobi desert, some 2,000 kms (1250 miles) northwest of Beijing on April 20, 2016.

The 2016 Silk Way Rally takes place in July and will see competitors race from Moscow's Red Square to the Chinese capital Beijing.

Britain's Queen Elizabeth II (C) accompanied by Prince Philip, Duke of Edinburgh waves to well wishers during a walkabout on her 90th birthday in Windsor on April 21, 2016. Britain celebrated the 90th birthday of Queen Elizabeth II on Thursday with tributes to a popular monarch who has steered it through the decline of empire and a wave of scandals to the Internet age.

Cuba's former president Fidel Castro (2nd L) sits near his brother and Cuba's president Raul Castro (2nd R) and Cuba's vice president Jose Ramon Machado (L) during the closing ceremony of the seventh Cuban Communist Party (PCC) congress in Havana, April 19, 2016.

Indian Civil defense volunteers stand with placards at a traffic junction in New Delhi on April 22, 2016, as they attempt to raise awareness among motorists of the implementation of a second round of odd-even license plate car restrictions.

On April 15, New Delhi imposed driving restrictions that will take around a million cars off its roads for the second time this year, seeking to improve air quality in the world's most polluted capital. The scheme restricts cars to alternate days according to whether they carry odd or even-numbered licence plates.

Russian communist party supporters hold pictures of Soviet state founder Vladimir Lenin as they attend a wreath-laying ceremony at Lenin's mausoleum marking his birthday at Red Square in Moscow on April 22, 2016.

View of smoke following an explosion at the petrochemical installation of Mexican Oil Company PEMEX in Coatzacoalcos, Veracruz state, Mexico on April 20, 2016. At least 30 employees were injured in the accident.

Chilean team Antunekul 2 competes in the Atacama Solar Challenge -- a solar car race in the Atacama Desert in northern Chile -- in Iquique , some 2000 km north of Santiago, on April 21,2016.

Fifteen teams from four countries are participating in the six-day 2300 km-race.

Prince fans Michael Scotland and Eudora Tucker stand at a street party hosted by director Spike Lee called "PRINCE We Love You Shockadelica Joint" to celebrate the life and music of Prince in the Brooklyn, New York, the day he died in Minnesota, April 21, 2016.

Spectators watch a snowboarder in a fancy costume slide down before an attempt to cross a pool of water at the foot of a ski slope at the Bobrovy Log ski resort on the suburbs of the Siberian city of Krasnoyarsk, Russia, April 17, 2016.

Skiers and snowboarders took part in the annual "Gornoluzhnik" amateur event marking the end of the ski season at the Siberian resort.

A loader works on a flooded street in Santiago, April 17, 2016.

Spanish matador Javier Castano looks at a bull with his face splattered by bull's blood after driving a sword into it to kill it during a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain, April 17, 2016.

Demonstrators celebrate after the lower house of Congress voted to proceed with the impeachment of Brazil's President Dilma Rousseff in Sao Paulo, Brazil, April 17, 2016.

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 ahead of Earth Day, April 18, 2016.

Migrants sit in a rubber dinghy during a rescue operation by SOS Mediterranee ship Aquarius off the coast of the Italian island of Lampedusa in this handout received April 18, 2016.

As many as 500 migrants may have drowned in the Mediterranean during the week.

Actor Leonardo DiCaprio delivers his remarks during the Paris Agreement on climate change held at the United Nations Headquarters in Manhattan, New York, April 22, 2016.

The actor urged the UN to leave fossil fuels "in the ground where they belong."

A fish jumps over a net as a boy works in a fish farm at Htantapin township, outside Rangoon, now known as Yangon, February 18, 2016.

Japan Ground Self-Defense Force soldiers carry a person found under landslide rubble following an earthquake in Minamiaso town, Kumamoto prefecture, southern Japan, April 19, 2016.

The sun rises next to a Buddha statue while monks and novices gather to receive alms at Wat Phra Dhammakaya temple, in what organizers said was a meeting of over 100,000 monks in Pathum Thani, outside Bangkok, April 22, 2016.

A wreath is pictured on the star of late actress Doris Roberts on the Hollywood Walk of Fame in Los Angeles, April 19, 2016. The actress died at the age of 90 on April 17, 2016.

Nirmaya Tamang attends physiotherapy at Physical Rehabilitation Center which treats earthquake victims, in Kathmandu, Nepal April 4, 2016.

A year after an earthquake in Nepal that killed nearly 9,000 people, the Physical Rehabilitation Centre in the capital Kathmandu treats victims who lost limbs during the disaster. Some 22,000 people were injured and close to a million homes destroyed in the tiny Himalayan country in two earthquakes in April and May last year.

Priestesses attend the Olympic flame lighting ceremony for the Rio 2016 Olympic Games inside the ancient Olympic Stadium on the site of ancient Olympia, Greece, April 21, 2016.

Evacuees who have been using their vehicles for shelter at a parking lot after a series of earthquakes, spend the night inside their cars in Kumamoto, Japan, April 20, 2016.

Britain's Prince William and his wife Catherine, the Duchess of Cambridge, pose as they sit in front of the Taj Mahal in Agra, India, April 16, 2016.

President Barack Obama turns to depart after holding a news conference with British Prime Minister David Cameron following their meeting at 10 Downing Street in London, April 22, 2016.

Eghy (L) uses his makeshift snorkel as his colleague lifts up green mussels to their boat in Jakarta Bay, Indonesia, April 20, 2016.

Juan Requesens (R), deputy of the Venezuelan coalition of opposition parties (MUD), argues with Venezuela's National Guards at the National Electoral Council (CNE) headquarters in Caracas, April 21, 2016.