Joff Summerfield, from Greenwich in south east London, rides his penny farthing across Westminster Bridge in central London on April 2, 2014, during his training ahead of taking part in this year's Spring Classics, to celebrate the Tour de France coming to London on 7th July. The Spring Classics include the Tour of Flanders in Belgium and Paris-Roubaix in France. (Photo by David Parry/PA Wire)

Brazilian Navy soldiers enter the unpacified Complexo da Mare, one of the largest “favela” complexes in Rio de Janeiro, on March 30, 2014. The government has deployed federal forces to occupy the group of violence-plagued slums ahead of the June 12 start of the 2014 FIFA World Cup. The group of 16 communities house around 130,000 residents and have been dominated by drug gangs and militias. (Photo by Mario Tama/Getty Images)

Anti-government protesters look at bloodstained floor of the bus they were traveling after an attack by suspected gunmen while on their way back from a protest in Bangkok, Thailand Tuesday, April 1, 2014. Gunmen have fired on a convoy of anti-government protesters in Thailand's capital, and four people have been wounded. (Photo by AP Photo)

Sculpture Radovan Zivny puts the finishing touches to a huge Lord of the Rings sand sculpture at Sandworld in Weymouth, where the seaside attraction will be open for the British summer season to the general public on Saturday April 5th 2014. (Photo by Ben Birchall/PA Wire)

In this picture taken on April 3, 2014, Singaporean competitors take part in a training session ahead of the Bodyflight World Challenge, the worlds largest indoor skydiving competition, at Bodyflight in Bedford. The 36 metre-tall tunnel was originally built in the 1950's as a Royal Aircraft Establishment test facility. 105 teams from all over the globe will take part in the two day formation skydiving event which takes place on April 4–5, 2014. (Photo by Leon Neal/AFP Photo)

In this picture taken on April 3, 2014, competitors take part in a training session ahead of the Bodyflight World Challenge, the worlds largest indoor skydiving competition, at Bodyflight in Bedford. (Photo by Leon Neal/AFP Photo)

A member of the US 8th Army recieves assistance from his teammates following his bout in a “Combatives” tournament at the Yongsan garrison US army base in Seoul on April 4, 2014. Combatives are a form of hand-to-hand combat which aim to teach soldiers how to fight without the use of firearms, borrowing techniques from various martial arts. (Photo by Ed Jones/AFP Photo)

Riot policemen take positions during an anti-government protest in Caracas on April 1, 2014. In a direct challenge to President Nicolas Maduro, prominent opposition politician Maria Corina Machado vowed to take her seat in the National Assembly despite her ouster by the Supreme Court. The head of the legislative body had ordered Machado expelled and her parliamentary immunity stripped last week after she tried to speak before the Organization of American States about her country's crisis. (Photo by Federico Parra/AFP Photo)

Residents walk on a street during a sandstorm in Hami, northwestern China's Xinjiang Uyghur autonomous region on April 3, 2014. Hami issued an “orange alert” for a sandstorm on April 3, warning residents to reduce outdoor activities and avoid dangerous jobs. (Photo by AFP Photo/STR)

View of “Comuna 13” shantytown, one of the poorest areas of Medellin, Antioquia department, Colombia on April 1, 2014, ahead of the World Urban Forum 7, which will take place from April 5 to 11. Medellin was chosen by popular vote through the internet as “Innovative City of the Year” in a contest organized by The Wall Street Journal and Citigroup in 2013. The distinction was basically made for its modern transportation system, public library, escalators built in a shantytown and schools that have allowed the integration of society. (Photo by Raul Arboleda/AFP Photo)

A sumo wrestler walks under cherry trees in full bloom at a ceremonial sumo exhibition at Yasukuni shrine in Tokyo on April 4, 2014. Sumo wrestlers took part in a “honozumo”, a ceremonial one-day exhibition for hundreds of spectators held within the shrine's precincts. (Photo by Kazuhiro Nogi/AFP Photo)

A women reacts following a reported air strike by government forces on April 2, 2014, in the Sakhur neighborhood in the northern Syrian city of Aleppo. More than 150,000 people have been killed in Syria since the conflict began in March 2011, the Syrian Observatory for Human Rights said in a new toll released. (Photo by Mohammed Al-Khatieb/AFP Photo)

Ukrainian cadets of Higher Naval School react as they embrace with their friend who has decided to stay in education in the school during the ceremony of departure in Sevastopol on April 4, 2014. Some 120 cadets who refused to take Russian citizenship, left the school in Crimean city of Sevastopol to Ukraine. (Photo by Vasiliy Batanov/AFP Photo)

A car full loaded with people and their belongings arrive in Bangui's PK-9 neighbourhood on April 4, 2014. Chad announced on April 3 it was withdrawing from the African peacekeeping force in the violence-torn Central African Republic after being accused of siding with a mainly Muslim movement that held power for most of last year. (Photo by Miguel Medina/AFP Photo)

This Monday, March 31, 2014 image provided by Clipperroundtheworld.com shows Andrew Taylor, 46, left, from London during his rescue after falling overboard from the 70-foot yacht, the Derry-Londonderry-Doire, during the Clipper Round the World Yacht Race. Taylor spent nearly two hours in the cold, rough North Pacific and says he never gave up hope of being rescued because he knew his fellow crew members were well-trained for such an emergency. (Photo by AP Photo/Clipperroundtheworld.com)

In this Tuesday, April 1, 2014 photo provided by The World Team, a group of 222 skydivers from 28 nations, team members dive over Eloy, Ariz. The jump was part of the group's ongoing attempt to set a world record by forming two distinct aerial formations within the same dive. The team did not break the record with this attempt. (Photo by Andrey Veselov/AP Photo/World Team)

Members of the World Team join together in a missing man formation during a jump over Eloy, Ariz., Thursday, April 3, 2014, after one of the group died during a jump earlier in the day. The accident occurred as the group tried to set a world record by forming two distinct aerial formations within the same dive earlier Thursday morning. Skydive Arizona blamed the accident on a malfunctioning parachute that was released too low to the ground to allow a reserve parachute to fully open. (Photo by Henny Wiggers/AP Photo/World Team)

An Afghan policeman stands guard on his vehicle in downtown Kabul, Afghanistan, Friday, April 4, 2014. Elections will take place on Saturday. (Photo by Massoud Hossaini/AP Photo)

A local woman sits on a bench atop a hill overlooking Russian Navy vessels anchored at a navy base in the Ukrainian Black Sea port of Sevastopol in Crimea, March 30, 2014. (Photo by Yannis Behrakis/Reuters)

A Russian tank crew member runs in front of his T-72B tank after their arrival in Crimea in the settlement of Gvardeiskoye near the Crimean city of Simferopol March 31, 2014. Russia is withdrawing a motorized infantry battalion from a region near Ukraine's eastern border, the Russian Defence Ministry was quoted as saying by state news agencies on Monday. (Photo by Yannis Behrakis/Reuters)

Lucy Hamlin and her husband, Spc. Timothy Hamlin, wait for permission to re-enter the Fort Hood military base, where they live, following a shooting on base on Wednesday, April 2, 2014, in Fort Hood, Texas. One person was killed and 14 injured in the shooting, and officials at the base said the shooter is believed to be dead. The details about the number of people hurt came from two U.S. officials who spoke on condition of anonymity because they were not authorized to discuss the information by name. (Photo by Tamir Kalifa/AP Photo)

Soldiers of the newly founded Ukrainian National guard take part in military exercises at a shooting range not far from Kiev on March 31, 2014, in the presence of the Ukrainian speaker of the parliament and interim president. Ukraine today reported a gradual withdrawal of Russian troops from its border that may be linked to Washington's latest push for a diplomatic solution to the worst East-West standoff since the Cold War. (Photo by Sergei Supinsky/AFP Photo)

Ukrainian tanks are placed on freight cars before the departure from Crimea to other regions of Ukraine in the settlement of Gvardeiskoye near the Crimean city of Simferopol March 31, 2014. Russia is withdrawing a motorized infantry battalion from a region near Ukraine's eastern border, the Russian Defence Ministry was quoted as saying by state news agencies on Monday. The United States says progress on resolving the East-West stand-off over Ukraine depends on Russia pulling back troops massed on the border. It was not clear whether other troops would pull back or had already withdrawn. (Photo by Reuters/Stringer)

This image provided by the U.S. Immigration and Customs Enforcement (ICE) agency shows an agent examining one of two tunnels discovered April 1, 2014 in San Diego's Otay Mesa industrial park. The first tunnel, stretching about 600 yards, was discovered on Tuesday. Authorities say it was equipped with lighting, a crude rail system and wooden trusses. The other tunnel was discovered Thursday. It's described as stretching more than 700 yards and more sophisticated, with an electric rail system and ventilation equipment. (Photo by AP Photo/ ICE)

Female members of Palestinian security forces loyal to Hamas show their skills during a military graduation ceremony in Gaza City on April 2, 2014. The Hamas-ruled Gaza Strip has been under blockade since 2006, after militants captured an Israeli soldier in a cross-border raid. (Photo by Mohammed Abed/AFP Photo)

Self-defense activists perform military exercises at a military training ground outside Kiev, Ukraine, Monday, March 31, 2014. Ukrainian Acting Foreign Minister Andriy Deshchytsa has said that the new Ukrainian government is not planning to lead Ukraine into NATO. (Photo by Efrem Lukatsky/AP Photo)

PETA activists demonstrate the slaughtering of a dummy seal in front of the Canadian Consulate in downtown Los Angeles, California on March 31, 2014. The demand for seal fur has plummeted to the point that Canada's annual massacre of tens of thousands of baby harp seals is costing the Canadian government about $7 million a year in subsidies. (Photo by Joe Klamar/AFP Photo)

Riot police assault a demonstrator during a protest against unemployment in front of the Moroccan Parliament in Rabat on April 2, 2014. (Photo by Fadel Senna/AFP Photo)

British actress Emma Watson poses for pictures on the red carpet as she arrive for the UK premiere of her latest film “Noah” in Leicester Square, central London, on March 31, 2014. (Photo by Ben Stansall/AFP Photo)

British actress Emma Watson poses for pictures on the red carpet as she arrive for the UK premiere of her latest film “Noah” in Leicester Square, central London, on March 31, 2014. (Photo by Jonathan Short/Paul Hackett/Invision/AP Photo/Reuters)

Medal of Honor recipient Sgt. 1st Class Leroy Petry stands with his prosthetic hand over his heart and wears his Medal of Honor during the “Pledge of Allegiance” at the Capitol in Olympia, Wash., during a ceremony to honor Petry and other recipients of the Medal of Honor who are from Washington state, on April 2, 2014. Petry lost his hand in 2008 when an enemy grenade he was throwing away from fellow soldiers detonated while in combat in Afghanistan. (Photo by Ted S. Warren/Associated Press)

A model poses on the runway at the Fashion Without Borders – Daria Razumihina show on day 5 of Mercedes-Benz Fashion Week Russia F/W 2014-2015 on March 31, 2014 in Moscow, Russia. (Photo by Epsilon/Getty Images)

Planes land in fog at Heathrow Airport, west London, as heavy fog covers a many parts of the south east, on April 1, 2014. (Photo by Steve Parsons/PA Wire)