Argentinian Navy's training ship arrives in Spanish Navy port in Ferrol, A Coruna, northwestern Spain, 04 August 2016. The ship is on its 45th teaching trip coinciding with the 200th anniversary of the Declaration of Independence of Argentina.

Cabalar/EPA

Argentinian Navy’s training ship arrives in Spanish Navy port in Ferrol, A Coruna northwestern Spain. The ship is on its 45th teaching trip coinciding with the 200th anniversary of the Declaration of Independence of Argentina 

Women react as they stand at the windows of a house watching Kashmiri Muslims carry a body of 20-year-old Riyaz Ahmed Shah during his funeral in downtown Srinagar on August 3, 2016.  Fresh clashes erupted between government forces and thousands of mourners on August 3 in Indian-administered Kashmir after two more civilians were killed in the restive region, witnesses and police said. / AFP PHOTO / TAUSEEF MUSTAFATAUSEEF MUSTAFA/AFP/Getty Images

Tauseef Mustafa/AFP

Women react as they stand at the windows of a house watching Kashmiri Muslims carry a body of 20 year old Riyaz Ahmed Shah during his funeral in downtown Srinagar

A man takes a fishing boat on a lake in Shi'en, Hubei Province, China, August 4, 2016.

Reuters

A man takes a fishing boat on a lake in Shi’en, Hubei Province, China,

A police officer guards the scene of a knife attack on August 4, 2016 in London, England. Six people were attacked by a 19 year old man with a knife at 10.30pm in Russell Square, London last night. A woman died of her injuries. The suspect was arrested at the scene and is being held at a London Hospital. Police say mental health issues are a significant factor but aren't ruling out terrorism.

Carl Court/Getty

A police officer guards the scene of a knife attack in London, England. Six people were attacked by a 19 year old man with a knife at 10.30pm on Wednesday night in Russell Square. A woman died of her injuries. The suspect was arrested at the scene and is being held at a London Hospital

An image made available on 04 August 2016 shows a cross is pictured in front of the plain of Chablais at the summit of Croix des Chaux (2012m) above Gryon VD, western Switzerland, 03 August 2016.  EPA/ANTHONY ANEX

Anthony Anex/EPA

A cross is pictured in front of the plain of Chablais at the summit of Croix des Chaux (2012m) above Gryon VD, western Switzerland

A young Bedouin lead his camel herd at sunset outside Beersheba, in southern Israel, 03 August 2016

Abir Sultan/EPA

A young Bedouin lead his camel herd at sunset outside Beersheba, in southern Israel 

Stefan Roussea/AFP/Getty

Armed Metropolitan Police counter terrorism officers take part in an exercise on the River Thames, London 

Ultra-Orthodox Jewish men take part in the funeral ceremony of Rabbi Moshe Mordechai Chadash, head of the "Or Alhanan" Jewish Seminary, in Jerusalem August 3, 2016. REUTERS/Ronen Zvulun

Ronen Zvulun/Reuters

Ultra-Orthodox Jewish men take part in the funeral ceremony of Rabbi Moshe Mordechai Chadash, head of the “Or Alhanan” Jewish Seminary, in Jerusalem 

Former Taliban militants surrender their weapons during a reconciliation ceremony in Herat, Afghanistan, 03 August 2016. A group of 16 former Taliban militants on 03 August laid down their arms in Herat and joined the peace process. Under an amnesty launched by the former President Hamid Karzai and backed by the US in November 2004, hundreds of anti-government militants have so far surrendered to the government.

Jalil Rezayee/EPA

Former Taliban militants surrender their weapons during a reconciliation ceremony in Herat, Afghanistan. A group of 16 former Taliban militants arms in Herat and joined the peace process. Under an amnesty launched by the former President Hamid Karzai and backed by the US in November 2004, hundreds of anti-government militants have so far surrendered to the government 

Supporters of Republican presidential candidate Donald Trump stand for the pledge of allegiance during a campaign rally at Briar Woods High School, Tuesday, Aug. 2, 2016, in Ashburn, Va. (AP Photo/Evan Vucci)

Evan Vucci/AP

Supporters of Republican presidential candidate Donald Trump stand for the pledge of allegiance during a campaign rally at Briar Woods High School, Ashburn Virginia 

People play volleyball on Copacabana beach ahead of the Rio Olympic Games, Brazil. PRESS ASSOCIATION Photo. Picture date: Tuesday August 2, 2016. Photo credit should read: Mike Egerton/PA Wire. EDITORIAL USE ONLY

Mike Egerton/PA

People play volleyball on Copacabana beach ahead of the Rio Olympic Games, Brazil 

LONDON, ENGLAND - AUGUST 02:  An armed Metropolitan Police officer poses for a photograph as he patrols in Downing Street on August 2, 2016 in London, England. Security measures continue to be high in London while the current UK threat level for international terrorism is severe, meaning an attack is highly likely.  (Photo by Carl Court/Getty Images)

Carl Court/Getty

An armed Metropolitan Police officer poses for a photograph as he patrols in Downing Street, in London, England. Security measures continue to be high in London while the current UK threat level for international terrorism is severe, meaning an attack is highly likely 

A woman arranges signs showing departments of Tokyo Metropolitan Government as she prepares an event where Tokyo's first woman governor Yuriko Koike makes a speech at Tokyo Metropolitan Government Building in Tokyo, Japan, August 2, 2016.   REUTERS/Kim Kyung-Hoon

Kim Kyung-Hoon/Reuters

A woman arranges signs showing departments of Tokyo Metropolitan Government as she prepares an event where Tokyo’s first woman governor Yuriko Koike makes a speech at Tokyo Metropolitan Government Building in Tokyo, Japan 

People walk on a sightseeing platform in Zhangjiajie, Hunan Province, China, August 1, 2016. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA.

Reuters

People walk on a sightseeing platform in Zhangjiajie, Hunan Province in China 

MIAMI, FL - AUGUST 01:  Larry Smart, a Miami-Dade County mosquito control inspector, uses a fogger to spray pesticide to kill mosquitos in the Wynwood neighborhood as the county fights to control the Zika virus outbreak on August 1, 2016 in Miami, Florida. Today, it was announced that 10 more individuals have been infected with the Zika virus by local mosquitoes.  (Photo by Joe Raedle/Getty Images) *** BESTPIX ***

Joe Raedle/Getty

Larry Smart, a Miami-Dade County mosquito control inspector, uses a fogger to spray pesticide to kill mosquitos in the Wynwood neighbourhood as the county fights to control the Zika virus outbreak in Miami, Florida 

Fishing boats are parked in a port as Typhoon Nida approaches Guangzhou, Guangdong Province, China, August 1, 2016. China Daily/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. CHINA OUT.     TPX IMAGES OF THE DAY

China Daily/Reuters

Fishing boats are parked in a port as Typhoon Nida approaches Guangzhou, Guangdong Province, China 

Rio Olympics - Olympic Park - Rio de Janeiro, Brazil - 01/08/2016. A divers practices at the Olympic diving venue.

Damir Sagolj/Reuters

A divers practices at the Olympic diving venue in Rio de Janeiro 

PATTAYA,THAILAND -JULY 31, 2016:  Bar girls use their mobile phones outside a bar along the Walking Street where bars and sex scenes are a commonplace July 31, 2016 in Pattaya, Thailand. Thailand's first female minister of tourism would like the sex trade that is a huge business in the country to be banned. Tourists flock to Thailand for many sights including beautiful beaches but also for sex tourism. Cities like Bangkok and Pattaya are well known as hubs of the Southeast Asian sex trade, despite the fact that prostitution has been illegal in Thailand since 1960.(Photo by Paula Bronstein/ Getty Images)

Paula Bronstein/Getty

Bar girls use their mobile phones outside a bar along the Walking Street in Pattaya, Thailand. Thailand’s first female minister of tourism would like the sex trade that is a huge business in the country to be banned

Indian artists perform during the Bonalu festival at the Sri Akkanna Madanna Mahankali Temple in Hyderabad on August 1, 2016. The eleven-day 'Bonalu' festival sees ritual offerings of food and dancing made to the  Hindu goddess Maha Kali, who is honoured mainly by women during the event. / AFP PHOTO / NOAH SEELAMNOAH SEELAM/AFP/Getty Images

Noah Seelam/AFP/Getty

Indian artists perform during the Bonalu festival at the Sri Akkanna Madanna Mahankali Temple in Hyderabad. The eleven-day ‘Bonalu’ festival sees ritual offerings of food and dancing made to the Hindu goddess Maha Kali 

TOPSHOT - An Afghan farmer harvestS fresh wheat grains in a field On the outskirts of Herat on July 31, 2016. / AFP PHOTO / AREF KARIMIAREF KARIMI/AFP/Getty Images

Aref Karimiaref/AFP/Getty

An Afghan farmer harvests fresh wheat grains in a field on the outskirts of Herat