Pictures Of The Day: Friday 22nd April

LONDON, ENGLAND - APRIL 22: British Prime Minister David Cameron greets US President Barack Obama as they meet at Downing Street on April 22, 2016 in London, England. The President and his wife are currently on a brief visit to the UK where they will have lunch with HM Queen Elizabeth II at Windsor Castle and dinner with Prince William and his wife Catherine, Duchess of Cambridge at Kensington Palace. Mr Obama will visit 10 Downing Street on Friday afternoon where he is to hold a joint press conference with British Prime Minister David Cameron and is expected to make his case for the UK to remain inside the European Union. (Photo by Matt Cardy/Getty Images)

Royal Guardsman look out from the Quadrangle of Windsor Castle after President Barack Obama and first lady Michelle Obama arrived at Windsor Castle in Windsor, England, Friday, April 22, 2016. Obama is spending his first full day in the United Kingdom on Friday after arriving Thursday evening. He started by having lunch at Windsor Castle with Queen Elizabeth II, who celebrates her 90th birthday this week. (AP Photo/Carolyn Kaster)

Employees present a newborn male (R) and two female lion cubs to the public at the city zoo in Saint Petersburg, on April, 22, 2016.The animals were born on March 15, 2016. / AFP / OLGA MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images)

Ukip leader Nigel Farage after speaking at Leadenhall Market in London, where he said that Barack Obama should have stayed in Washington, as he claimed the US president had no comprehension of the European Union.

The O2 in London displays a tribute to Prince, as a post-mortem examination will take place on Friday on the body of the pop superstar who died after being found collapsed in a lift at his home in Minnesota.

Vicky Balch arrives at North Staffordshire Justice Centre in Newcastle-under-Lyme, where Alton Towers operator Merlin indicated a guilty plea to a charge of breaching the Health and Safety at Work Act over the Smiler rollercoaster crash in June last year which left five people, including Vicky, seriously injured.

Swiss tennis champion Roger Federer (C) takes part in the ceremony marking the inauguration of a street bearing his name next to Mayor of the city of Biel, Erich Fehr (R) and member of the council of Biel Barbara Schwickert on April 21, 2016 in Biel.The street is located next to the Swiss tennis center where Federer completed its tennis studies. / AFP / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

PATHUM THANI, THAILAND - APRIL 22: Buddhist devotees wait for the offering at Wat Dhammakaya Temple as over 100,000 buddhist monks and novices gather to mark 'Earth Day' and receive alms and offering, in Pathum Thani, north of Bangkok, Thailand on April 22, 2016. The event focus on giving generosity, observing the precepts and practicing meditation for a better world through the teach of Buddha. (Photo by Guillaume Payen/Anadolu Agency/Getty Images)

PATHUM THANI, THAILAND - APRIL 22: A general view of the Wat Dhammakaya Temple as over 100,000 buddhist monks and novices gather to mark 'Earth Day' and receive alms and offering, in Pathum Thani, north of Bangkok, Thailand on April 22, 2016. The event focus on giving generosity, observing the precepts and practicing meditation for a better world through the teach of Buddha. (Photo by Guillaume Payen/Anadolu Agency/Getty Images)

German Chancellor Angela Merkel drinks beer during the 500th anniversary ceremony of the German Beer Purity Law (Reinheitsgebot) in Ingolstadt, Germany, on April 22, 2016. / AFP / POOL / MICHAELA REHLE (Photo credit should read MICHAELA REHLE/AFP/Getty Images)

LONDON, ENGLAND - APRIL 21: US President Barack Obama steps off Air Force One upon arrival at Stansted Airport on April 21, 2016 in London, England. The President and his wife are currently on a four day visit to the UK where they will have lunch with HM Queen Elizabeth II at Windsor Castle and dinner with Prince William and his wife Catherine, Duchess of Cambridge at Kensington Palace. Mr Obama will visit 10 Downing Street on Friday afternoon where he is to hold a joint press conference with British Prime Minister David Cameron and is expected to make his case for the UK to remain inside the European Union. (Photo by Dan Kitwood/Getty Images)

Canadian Prime Minister Justin Trudeau (R) spars with a youth in the in the ring at Gleason's Boxing Gym in the Brooklyn borough of New York, U.S., April 21, 2016. REUTERS/Carlo Allegri

WEST HOLLYWOOD, CA - APRIL 21: Christina Aguilera attends 'The Voice' Karaoke For Charity at HYDE Sunset: Kitchen + Cocktails on April 21, 2016 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)

Buddhist 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. REUTERS/Jorge Silva

Employees of Korea Railroad Corp (KORAIL) examine the derailed Mugunghwa train in Yeosu, South Korea, April 22, 2016. Hwang Hee-kyu/News1 via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. SOUTH KOREA OUT. NO RESALES. NO ARCHIVES.

Cast member Lola Kirke poses at a premiere screening for the television series "Mozart in the Jungle" at The Hollywood Roosevelt in Los Angeles, U.S., April 21, 2016. REUTERS/Mario Anzuoni

A scavenger (top) wades through a polluted river using a makeshift raft made of styrofoam to collect reusable items at Capulong Tondo, metro Manila April 22, 2016. REUTERS/Romeo Ranoco

NEW YORK, NY - APRIL 21: Director Spike Lee attends 'PRINCE We Love You Shockadelica Joint- A Celebration of His Life' on April 21, 2016 in Brooklyn, New York. Prince died earlier today at his Paisley Park compound at the age of 57. (Photo by Brent N. Clarke/Getty Images)

People watch as City Hall is illuminated in purple in remembrance of the late singer Prince in Downtown Los Angeles, U.S., April 21, 2016. REUTERS/Mario Anzuoni

MINNEAPOLIS, MN - APRIL 21: People listen to Prince music during a memorial street party outside the First Avenue nightclub on April 21, 2016 in Minneapolis, Minnesota. Prince, 57, was pronounced dead shortly after being found unresponsive today at Paisley Park Studios in Chanhassen, Minnesota near Minneapolis. (Photo by Scott Olson/Getty Images)

NEW YORK, NY - APRIL 21: A view of the Prince tribute at Times Square Hard Rock Cafe on April 21, 2016 in New York, New York. Prince died earlier today at his Paisley Park compound at the age of 57. (Photo by Roy Rochlin/Getty Images)

SYDNEY, AUSTRALIA - APRIL 22: Michelle Bridges poses following a workout with fans at TwitterAU on April 22, 2016 in Sydney, Australia. (Photo by Mark Sullivan/Getty Images)

A scavenger wades through a polluted river using a makeshift raft made of styrofoam to collect reusable items at Capulong Tondo, metro Manila April 22, 2016. REUTERS/Romeo Ranoco

A makeshift memorial is seen as fans gather at Harlem's Apollo Theater to celebrate the life of deceased musician Prince in the Manhattan borough of New York, U.S., April 21, 2016. REUTERS/Andrew Kelly EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE

Workers install a billboard outside the venue for the Beijing Auto Show in Beijing on April 22, 2016. The global car industry gathers for its biggest annual event in China as Analysts say the brakes are coming on in the world's number one auto market, with the slowing economy dragging on vehicle demand. / AFP / GREG BAKER (Photo credit should read GREG BAKER/AFP/Getty Images)

Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, smiles while speaking during a campaign event in Hartford, Connecticut, U.S., on Thursday, April 21, 2016. Tuesday night's New York primary not only ended a multi-state losing streak for current front-runners Donald Trump and Clinton, who won roughly 60 percent of the vote each, but also moved them an important step closer to the general election. Photographer: Victor J. Blue/Bloomberg via Getty Images

People walk on the wood bridge to visit a mangrove center during Earth Day in Denpasar on Bali island on April 22, 2016.World Earth Day is celebrated every year as an annual event by the people all across the world on April 22 in order to increase the awareness among people about the environment safety as well as to demonstrate the environmental protection measures. / AFP / SONNY TUMBELAKA (Photo credit should read SONNY TUMBELAKA/AFP/Getty Images)

AUCKLAND, NEW ZEALAND - APRIL 22: Angie Petty of New Zealand celebrates after being named in the New Zealand Olympic Athletics Team Selection announcement at the AUT Millennium Athletics Track on April 22, 2016 in Auckland, New Zealand. (Photo by Hannah Peters/Getty Images for NZOC)