Migrants sleep on a bench at a park in Belgrade, Serbia, Friday, Aug. 28, 2015. Over 10,000 migrants, including many women with babies and small children, have crossed into Serbia over the past few days and headed toward Hungary and the EU Schengen Area, a zone with no internal border checks between member countries

Marko Drobnjakovic/AP

Migrants sleep on a bench at a park in Belgrade, Serbia on Friday. Over 10,000 migrants, including many women with babies and small children, have crossed into Serbia over the past few days and headed toward Hungary and the EU Schengen Area

An KUH-1 Surion helicopters hover during the South Korea and U.S. joint military exercise at the Seungjin firing drill ground on Friday in Pocheon, South Korea. South Korea and U.S. military held a joint live fire military exercise at the Seungjin firing drill ground. The exercise is intended to prepare the South Korean defense force amid the tension with North Korea

Chung Sung-Jun/Getty Images

An KUH-1 Surion helicopters hover during the South Korea and U.S. joint military exercise at the Seungjin firing drill ground on Friday in Pocheon, South Korea. South Korea and U.S. military held a joint live fire military exercise at the Seungjin firing drill ground

Janek Oiglane of Estonia competes in the men's decathlon shot put event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 28, 2015.

Fabrizio Bensch/Reuters

Janek Oiglane of Estonia competes in the men’s decathlon shot put event during the 15th IAAF World Championships at the National Stadium in Beijing, China

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing...Usain Bolt of Jamaica (L) sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. Bolt finished in first place and Gatlin in second place

Kai Pfaffenbach/Reuters

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men’s 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China on Thursday. Bolt finished in first place and Gatlin in second place

A Syrian migrant carries children as he walks along railway track to cross Serbian border with Hungary near the village of Horgos...A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos August 27, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army as record numbers of migrants, many of them Syrian refugees, passed through coils of razor-wire into Europe

Marko Djurica/Reuters

A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos on Thursday

Summer weather Aug 27th 2015...A faint Aurora can be seen over Bamburgh lighthouse in Northumberland the early hours of this morning. PRESS ASSOCIATION Photo. Picture date: Thursday August 27, 2015

Owen Humphreys/PA

A faint Aurora can be seen over Bamburgh lighthouse in Northumberland the early hours of this morning

A paramilitary police officer in plain-clothes holding an umbrella keeps watch on Beijing's Tiananmen Square, on Thursday. Major Western leaders will not attend a military parade in China next week to mark the end of World War Two, leaving President Xi Jinping to stand with leaders and officials from Russia, Sudan, Venezuela and North Korea at his highest-profile event of 2015

Jason Lee/Reuters

A paramilitary police officer in plain-clothes holding an umbrella keeps watch on Beijing’s Tiananmen Square, on Thursday

A young Yemeni holds an automatic weapon stands near effigies depicting the victims of the ongoing conflict during a rally against the military offensive carried out by the Saudi-led coalition, in Sanaa, Yemen

Yahya Arhab/EPA

A young Yemeni holds an automatic weapon stands near effigies depicting the victims of the ongoing conflict during a rally against the military offensive carried out by the Saudi-led coalition, in Sanaa, Yemen

The World's Biggest Tomato Fight At Tomatina Festival...BUNOL, SPAIN - AUGUST 26:  Revellers enjoy the atmosphere in tomato pulp while participating the annual Tomatina festival on August 26, 2015 in Bunol, Spain. An estimated 22,000 people threw 150 tons of ripe tomatoes in the world's biggest tomato fight held annually in this Spanish Mediterranean town.

David Ramos/Getty Images

Revellers enjoy the atmosphere in tomato pulp while participating the annual Tomatina festival on Wednesday in Bunol, Spain

Families of Palestinians who were abduct...Families of Palestinians who were abducted of by gunmen is Egypt's Sinai's northern region, take part in a demonstration calling for the release at the Rafah border crossing with Egyptp in the southern Gaza Strip, on August 26, 2015. Gunmen in Egypt boarded a bus carrying Palestinians from Cairo to Gaza and seized four of the passengers before letting the others continue, Hamas officials in the strip said

Said Khatib/AFP

Families of Palestinians who were abducted by gunmen is Egypt’s Sinai’s northern region, take part in a demonstration calling for their release at the Rafah border crossing with Egypt in the southern Gaza Strip, on Wednesday

A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela...A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela

Carlos Garcia Rawlins/Reuters

A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela

An investor looks at an electronic board showing stock information of Shanghai Stock Exchange Composite Index at a brokerage house in Beijing, August 26, 2015. Asian shares struggled on Wednesday as investors feared fresh rate cuts in China would not be enough to stabilise its slowing economy or halt a stock collapse that is wreaking havoc in global markets

Jason Lee/Reuters

An investor looks at an electronic board showing stock information of Shanghai Stock Exchange Composite Index at a brokerage house in Beijing. Asian shares struggled on Wednesday as investors feared fresh rate cuts in China would not be enough to stabilise its slowing economy or halt a stock collapse that is wreaking havoc in global markets

A trader gestures on the floor of the New York Stock Exchange at the start of the trading day in New York, New York, USA,on Monday. Global markets have been reacting to the economic situation in China and the Dow Jones Industrial average followed that trend losing 1,000 points in early trading

Justin Lane/EPA

A trader gestures on the floor of the New York Stock Exchange at the start of the trading day in New York, New York, USA,on Monday. Global markets have been reacting to the economic situation in China and the Dow Jones Industrial average followed that trend losing 1,000 points in early trading before recovering

The so-called "Stone Age"-travellers, Lukas Heinen, Veronika Hocke and Marco Hocke walk in the forest near Altenbeken, western Germany, on their way from Detmold to Bonn

Bernd.Thissen/DPA/AFP

The so-called “Stone Age”-travellers, Lukas Heinen, Veronika Hocke and Marco Hocke walk in the forest near Altenbeken, western Germany, on their way from Detmold to Bonn

A Ukrainian armed forces military unit marches at Kiev's Independence Square, Ukraine, 24 August 2015, during a march on the occasion of Independence Day. Ukrainians marked the 24th anniversary of Ukraine's independence from the Soviet Union in 1991

Sergey Dolzhenko/EPA

A Ukrainian armed forces military unit marches at Kiev’s Independence Square, Ukraine, on Monday, during a march on the occasion of Independence Day

Migrants from Syria sit along a road as they wait for a bus in the village of Miratovac near the town of Presevo, Serbia August 24, 2015. Long lines of migrants, many of them refugees from Syria, snaked through southern Serbia by foot on Monday before jumping on trains and buses north to Hungary and the last leg of an increasingly desperate journey to western Europe

Marko Djurica/Reuters

Migrants from Syria sit along a road as they wait for a bus in the village of Miratovac near the town of Presevo, Serbia. Long lines of migrants, many of them refugees from Syria, snaked through southern Serbia by foot on Monday before jumping on trains and buses north to Hungary and the last leg of an increasingly desperate journey to western Europe

An anti-North Korean activist holds a de...An anti-North Korean activist holds a defaced North Korean flag as he stands on the Unification Bridge that leads to the Demilitarized Zone (DMZ) between North and South Korea in Paju on August 24, 2015. South Korea's president hardened her line with North Korea on August 24, demanding an unequivocal apology for recent provocations as the two rivals struggled to negotiate their way out of a dangerous military standoff

Ed Jones/AFP

An anti-North Korean activist holds a defaced North Korean flag as he stands on the Unification Bridge that leads to the Demilitarized Zone (DMZ) between North and South Korea in Paju on Monday

A Russian Yakovlev Yak-130 Mitten subsonic two-seat advanced jet trainer performs on rehearsal day for the MAKS-2015, the International Aviation and Space Show, in Zhukovsky, outside Moscow, on August 21, 2015. The MAKS-2015 will be held in Zhukovsky from August 25 to 30.

Krill Kudryavtsev/AFP

A Russian Yakovlev Yak-130 Mitten subsonic two-seat advanced jet trainer performs on rehearsal day for the MAKS-2015, the International Aviation and Space Show, in Zhukovsky, outside Moscow, on Friday

 England's Ben Stokes celebrates the wicket of Australia's Adam Voges

Paul Childs/Action Images/Reuters

England’s Ben Stokes celebrates the wicket of Australia’s Adam Voges during the fifth Ashes test at the Oval in Kennington, London on Friday

The sun rises over Whitley Bay with the top of St Mary's lighthouse visible, as hot and humid air is expected to be pushed into northern Europe this weekend, including Britain, creating a "Spanish Plume"

Owen Humphreys/PA

The sun rises over Whitley Bay with the top of St Mary’s lighthouse visible, as hot and humid air is expected to be pushed into northern Europe this weekend, including Britain, creating a “Spanish Plume”