Anti-nuclear activists block one of the entrances to Faslane naval base on the Clyde in Faslane, Scotland. The Scrap Trident campaign is urging voters to back only those candidates who firmly reject the plan to replace the current Trident system

Jeff Mitchell/Getty Images

Anti-nuclear activists block one of the entrances to Faslane naval base on the Clyde in Faslane, Scotland. The Scrap Trident campaign is urging voters to back only those candidates who firmly reject the plan to replace the current Trident system

Fans listen to David Guetta at the Coachella Valley Music and Arts Festival in Indio, California.

Lucy Nicholson/Reuters

Fans listen to David Guetta at the Coachella Valley Music and Arts Festival in Indio, California.

A young Yemeni poses with a gun during a protest against Saudi-led airstrikes on Yemen, outside the Sana a-based UN offices in Sana a, Yemen, 13 April 2015. According to reports, Yemeni students rallied outside the Sana a-based UN offices, calling for an end of the Saudi-led military Decisive Storm operation, accusing the Saudi-led coalition of attacking schools and civilian houses throughout Yemen in their bid the degrade the capabilities of the Houthis and their allies.

Yahya Arhab/EPA

A young Yemeni poses with a gun during a protest against Saudi-led airstrikes on Yemen, outside the Sanaa based UN offices in Sanaa, Yemen on Monday

Prime Minister David Cameron poses for a selfie with a local woman as he campaigns in Alnwick, England

Peter Macdiarmid/Getty Images

David Cameron, UK prime minister, poses for a selfie as he campaigns in Alnwick, England ahead of May’s general election.

Revellers use water guns as they participate in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 13, 2015. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck

Athit Perawongmetha/Reuters

Revellers take part in a water fight during Songkran festival celebrations at Silom road in Bangkok on Monday. The Songkran festival, also known as the water festival, marks the start of Thailand’s traditional New Year and is believed to wash away bad luck.

Nigel Farage, the leader of the United Kingdom Independence Party, laughs during a visit to a factory in Clacton, Essex.

Peter Nicholls/Reuters

Nigel Farage, the leader of the UK Independence party, laughs during a visit to a factory in Clacton, Essex.

A Bulgarian Orthodox priest leads an annual religious march marking the second day of Easter at the Bachkovo monastery on on April 13, 2015.

Nikolay Doychinov/AFP

An Orthodox priest leads an annual religious march marking the second day of Easter at the Bachkovo monastery in Bulgaria on Monday.

A woman does acrobatics as she waits for a band to start playing at the Coachella Valley Music and Arts Festival in Indio, California

Lucy Nicholson/Reuters

A woman does acrobatics as she waits for a band to start playing at the Coachella Valley Music and Arts Festival in Indio, California.

The sun rises off the North East coast near Cullercoats bay in North Tyneside, as Britain is set to bask in its hottest temperatures of the year so far, with the mercury expected to soar higher than in parts of Spain this week.

Owen Humphreys/PA

The sun rises off the northeast coast near Cullercoats Bay in North Tyneside, as Britain is set to bask in its hottest temperatures of the year.

German Chancellor Merkel and Indian Prime Minister Modi look at a UMI robotic arm at the world's largest industrial technology fair, the Hannover Messe, in Hanover...German Chancellor Angela Merkel and Indian Prime Minister Narendra Modi (R) look at a UMI robotic arm at the world's largest industrial technology fair, the Hannover Messe, in Hanover April 13, 2015.

Wolfgang Rattay/Reuters

German Chancellor Angela Merkel and Indian Prime Minister Narendra Modi look at a UMI robotic arm at the world’s largest industrial technology fair, the Hannover Messe, in Hanover.

A member of the Sudanese security forces waits outside a polling station where he is registered to vote, in Khartoum, Sudan, Monday, April 13, 2015.

Mosa'ab Elshamy/AP

A member of the Sudanese security forces waits outside a polling station, where he is registered to vote, in Khartoum, Sudan on Monday.

The Dome of the Rock is seen in the background as Palestinian youths practice their parkour skills during Friday prayers in Jerusalem's Old City.

Ammar Awad/Reuters

The Dome of the Rock is seen in the background as Palestinian youths practice their parkour skills during Friday prayers in Jerusalem’s Old City.

Serbian Orthodox Christian pilgrims pray as they carry wooden crosses, along the Via Dolorosa (Way of Suffering), during the Orthodox Good Friday procession in Jerusalem's old city.

Thomas Coex/AFP/Getty Images

Serbian Orthodox Christian pilgrims pray as they carry wooden crosses, along the Via Dolorosa (Way of Suffering), during the Orthodox Good Friday procession in Jerusalem’s old city.

Elephants spray tourists with water in celebration of the Songkran water festival in Thailand's Ayutthaya province, north of Bangkok

Chaiwat Subprasom/Reuters

Elephants spray tourists with water in celebration of the Songkran water festival in Ayutthaya province, Thailand

 Indian school children attend morning prayers at a school

Jaipal Singh/EPA

Indian school children attend morning prayers at a school on the outskirts of Jammu, the winter capital of Kashmir, India

Ukrainian servicemen take part in a military drill in the Zhytomyr region, some 150 kms from Kiev

Anatolii Stepanov/AFP/Getty Images

Ukrainian servicemen take part in a military drill in the Zhytomyr region, 150 km from Kiev 

George Osborne On The Conservative Party Election Trail In The South West   ***BESTPIX***

Matt Cardy/Getty Images

Chancellor George Osborne watches as old oil is drained from a car that is being serviced in the service and repair workshops as he meets apprentices at Hawkins garage near St Austell on Thursday

A member of the Afghan security force holds a woman while rescuing her from the site of an attack in Mazar-i-Sharif

Anil Usyan/Reuters

A member of the Afghan security force holds a woman while rescuing her from the site of an attack in Mazar-i-Sharif, on Wednesday.

French Prime Minister Manuel Valls (R) t...French Prime Minister Manuel Valls (R) tests out a machine at the factory of Haulotte, which manufactures people and material lifting equipment, in Saint-Etienne on April 9, 2015. AFP PHOTO / JEFF PACHOUDJEFF PACHOUD/AFP/Getty Images

Jeff Pachoud/AFP/Getty

French Prime Minister Manuel Valls tests out a machine at the factory of Haulotte, which manufactures material lifting equipment, in Saint-Etienne

A life-size Godzilla head is seen through a window of the "Gozilla View Room" of Hotel Gracery Shinjuku at Kabukicho shopping district in Tokyo on April 9, 2015. The Godzilla is a main feature of the new commercial complex comprising a 970-room hotel, movie theathres and restaurants which will be open this month.

Toru Yamanakatoru/AFP/Getty

A life-size Godzilla head is seen through a window of the “Gozilla View Room” at Hotel Gracery Shinjuku at Kabukicho shopping district in Japan. The Godzilla is a main feature of the new commercial complex comprising a 970-room hotel which opens this month