Children and honour guards watch a performance during the so-called parade of children's troops in Rostov-on-Don, southern Russia, on Thursday

Eduard Korniyenko/Reuters

Children and honour guards watch a performance during the so-called parade of children’s troops in Rostov-on-Don, southern Russia, on Thursday

The evening sky in Schwangau, southern Germany, is illuminated by lightning during thunderstorms

Jonas Walzberg/dpa/AP

The evening sky in Schwangau, southern Germany, is illuminated by lightning during thunderstorms

A group of Maoris perform for Britain's Prince Harry during his visit to Putiki Marae in Whanganui on Wednesday

Marty Melville/AFP

A group of Maoris perform for Britain’s Prince Harry during his visit to Putiki Marae in Whanganui on Wednesday

In this handout photograph taken and rel...In this handout photograph taken and released by The Indian Press Information Bureau (PIB) on May 14, 2015, India's Prime Minister Narendra Modi looks on as he visits The Terracota Warriors Museum in Xian.  India's Prime Minister Narendra Modi is taking his global investment push to China this week, as Asia's rival superpowers look to put aside a festering border dispute and identify areas of economic cooperation. Modi has arrived for his first visit as premier to China before heading to South Korea where he will also seek help to upgrade India's creaking infrastructure.    AFP PHOTO/PIB  ----EDITORS NOTE---- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT  - "AFP PHOTO /PIB " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS-/AFP/Getty Images

AFP/Getty

India’s Prime Minister Narendra Modi looks on as he visits The Terracota Warriors Museum in Xian. India’s Prime Minister Narendra Modi is taking his global investment push to China this week 

Women walk through debris in the early morning hours in Bhaktapur

Ahmad Masood/Reuters

Women walk through debris in the early morning hours in Bhaktapur near Kathmandu, Nepal, on Thursday . The Himalayan nation is still reeling from a devastating quake measuring 7.8 last month that killed more than 8,000 people and injured close to 20,000.

Passing Out Parade in Humhama...epa04747442 New recruits of the Indian Central Reserve Police Force (CRPF) take part in the passing out parade in Humhama, on the outskirts of Srinagar, the summer capital of Indian Kashmir, India, 14 May 2015. A total of 341 recruits were formally inducted into the CRPF, an Indian paramilitary force, after completing a 44-weeks training in physical fitness, weapon handling, commando operations and counter insurgency.  EPA/FAROOQ KHAN

Farooq Khan/EPA

New recruits of the Indian Central Reserve Police Force (CRPF) take part in the passing out parade in Humhama, on the outskirts of Srinagar, Kashmir, India. A total of 341 recruits were formally inducted into the CRPF, an Indian paramilitary force, after completing a 44-weeks training in physical fitness, weapon handling, commando operations and counter insurgency 

A detained protester cries in front of a burning barricade during a protest against President Pierre Nkurunziza's decision to run for a third term in Bujumbura, Burundi May 13, 2015.

Goran Tomasevic/Reuters

A detained protester cries in front of a burning barricade during a protest against President Pierre Nkurunziza’s decision to run for a third term in Bujumbura, Burundi 

 Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash

Win McNamee/Getty Images

Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday on Wednesday in north Philadelphia, Pennsylvania

A man walks past abandoned buildings with 'for sale' sign in central Athens, on Wednesday. Greece's economy contracted by 0.2 percent in the first quarter of this year, preliminary data from the national statistics agency ELSTAT showed, pushing the country back into recession

Louisa Gouliamaki/AFP

A man walks past abandoned buildings with ‘for sale’ sign in central Athens, on Wednesday

A man gestures as he celebrates in Bujumbura, Burundi.  Crowds poured onto the streets of Burundi's capital on Wednesday to celebrate after a general said he was dismissing President Pierre Nkurunziza for violating the constitution by seeking a third term in office

Goran Tomasevic/Reuters

A man gestures as he celebrates in Bujumbura, Burundi. Crowds poured onto the streets of Burundi’s capital on Wednesday to celebrate after a general said he was dismissing President Pierre Nkurunziza for violating the constitution by seeking a third term in office

Iraqi Shia Muslim worshippers mourn as they gather at the shrine of Imam Mussa al-Kadhim to mark the anniversary of the death of the eighth century revered Imam onWednesday in the northern district of Kadhimiya in the Iraqi capital Baghdad

Ahmad Al-Rubaye/AFP

Iraqi Shia Muslim worshippers mourn as they gather at the shrine of Imam Mussa al-Kadhim to mark the anniversary of the death of the eighth century revered Imam on Wednesday in the northern district of Kadhimiya in the Iraqi capital Baghdad

A miner sits at by a grave as relatives and friends gather at the cemetery in the Turkish town of Soma in the Manisa district, western Turkey, on Wednesday to mark the first anniversary of the Soma mine disaster in which 301 workers were killed after an explosion on May 13, 2014. The miners were killed after inhaling gas and toxic smoke from the fire which was caused when an abandoned pile of coal left next to an electrical transformer caught fire

Bulent Kilic/AFP

A miner sits at by a grave as relatives and friends gather at the cemetery in the Turkish town of Soma in the Manisa district, western Turkey, on Wednesday to mark the first anniversary of the Soma mine disaster in which 301 workers were killed after an explosion one year again

Director Emmanuelle Bercot poses during a photocall for the film "La tete haute" out of competition before the opening of the 68th Cannes Film Festival in Cannes...Director Emmanuelle Bercot poses during a photocall for the film "La tete haute" out of competition before the opening of the 68th Cannes Film Festival in Cannes, southern France, May 13, 2015. The 68th edition of the film festival will run from May 13 to May 24.

Eric Gaillard/Reuters

Director Emmanuelle Bercot poses during a photocall for the film “La tete haute” out of competition before the opening of the 68th Cannes Film Festival in Cannes, southern France on Wednesday

Pope Francis Pope Francis hugs a child as he arrives for his weekly general audience in St. Peter's Square at the Vatican, Wednesday, May 13, 2015

Alessandra Tarantino/AP

Pope Francis hugs a child as he arrives for his weekly general audience in St. Peter’s Square at the Vatican on Wednesday

A Nepalese resident carries a child as she walks past damaged homes in Bhaktapur on the outskirts of Kathmandu on May 13, 2015, following a new earthquake that hit May 12.  Rescuers were battling to reach survivors of a deadly new earthquake in Nepal that triggered landslides and brought down buildings, as the search continued for a US military helicopter that went missing while delivering aid. Thousands of traumatised survivors spent the night outdoors, afraid to return to their houses after the 7.3-magnitude quake hit, less than three weeks after the country was devastated by its deadliest quake in more than 80 years.

Prakash Mathema/AFP

A Nepalese resident carries a child as she walks past damaged homes in Bhaktapur on the outskirts of Kathmandu on Wednesday, following a new earthquake that hit the day before

NATO Secretary General Jens Stoltenberg ...NATO Secretary General Jens Stoltenberg is seen on the screen of a camera as he delivers a speech at NATO Foreign Minister's Meeting in Antalya on May 13, 2015. Turkey hosts NATO foreign ministers for a meeting to discuss threats to the alliance including Islamic State jihadists and the policies of Russia on its borders.    AFP PHOTO / OZAN KOSEOZAN KOSE/AFP/Getty Images

Ozan Kose/AFP

NATO Secretary General Jens Stoltenberg is seen on the screen of a camera as he delivers a speech at NATO Foreign Minister’s Meeting in Antalya on Wednesday. Turkey hosts NATO foreign ministers for a meeting to discuss threats to the alliance including Islamic State jihadists and the policies of Russia on its borders.

Saudi-led military coalition against Yemen's Houthi rebels...epa04745670 The sky over Sana'a is illuminated by anti-aircraft fire during an alleged airstrike of the Saudi-led coalition ahead of a 5-day ceasefire in Sana'a, Yemen, late 12 May 2015. A Saudi-led coalition halted its air raids on rebel-held positions in neighbouring Yemen late Tuesday as a 5-day ceasefire went into effect at 11 pm local time (2000 GMT). The ceasefire, which is intended to allow badly-needed humanitarian aid reach people affected by the conflict, was preceded by a day of intensive airstrikes on positions held by the Houthi rebels in northern and central Yemen.  EPA/YAHYA ARHAB

Yahya/EPA

The sky over Sana’a is illuminated by anti-aircraft fire during an alleged airstrike of the Saudi-led coalition ahead of a 5-day ceasefire in Sana’a, Yemen 

A man takes pictures of civilians lying down to take cover after hearing what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Jisr al-Hajj roundabout in Aleppo

Hosam Katan/Reuters

A man takes pictures of civilians lying down to take cover after hearing shelling in Aleppo on Tuesday

Spring weather May 12th 2015...Windsurfers and kitesurfers prepare their kites and boards as near perfect conditions are present at Weston-super-Mare beach on a warm and windy day in the Bristol Channel, Somerset. PRESS ASSOCIATION Photo. Picture date: Tuesday May 12, 2015. Photo credit should read: Ben Birchall/PA Wire

Ben Birchall/PA

Windsurfers and kitesurfers prepare their kites and boards as near perfect conditions are present at Weston-super-Mare beach on a warm and windy day in the Bristol Channel, Somerset 

The Viking Star going through the Thames Barrier in London as part of its maiden voyage. PRESS ASSOCIATION Photo. Picture date: Tuesday May 12, 2015. The delivery ceremony took place on March 28th when the ship was presented at Fincantieri s Marghera shipyard outside of Venice, Italy. On April 11th, Viking Star set sail from Istanbul making her way through the Mediterranean into the Atlantic on her way to be officially christened in Bergen, Norway on May 17th. Classified by Cruise Critic as a  small ship,  the all-veranda Viking Star has a gross tonnage of 47,800 tons, 465 cabins and will accommodate 930 passengers. It is engineered to allow direct access into most ports, so guests have an easy and efficient embark and debark. The Viking Star is one of three ocean cruise ships on order; the remaining two ships, Viking Sea and Viking Sky, are currently under construction

Viking Ocean Cruises/Jeff Moore/PA

The Viking Star going through the Thames Barrier in London as part of its maiden voyage on Tuesday