Residents take cover in a concrete pipe used as a bomb shelter, as a siren warning of incoming rockets is sounded in the southern community of Nitzan, near Ashdod July 8, 2014. Israel bombarded dozens of targets in the Gaza Strip on Tuesday, stepping up what it said might become a long-term offensive against Islamist Hamas after a surge in Palestinian rocket attacks on Israeli towns. (Photo by Finbarr O'Reilly/Reuters)

A man stands in front of the skyline after a rainy day in Toronto, July 8, 2014. (Photo by Mark Blinch/Reuters)

Walkers cross the river Waalbrug during the first day of the 98th annual four-days walking event, the “Vierdaagse” in Nijmegen, Netherlands, July 15, 2014. The “Nijmeegse Vierdaagse” is an annual public four-day field march which is held since 1909 in the third week of July. (Photo by Erik van 't Wout/EPA)

A pedestrian holds an umbrella in the colours of the Argentinian national flag during a rainy day on the 9 de Julio Avenue in Buenos Aires, July 12, 2014. (Photo by Ivan Alvarado/Reuters)

Young surfers, nicknamed “grommets” in local surfing parlance, wait for their friends to finish a post-sunset session on the waves off Wanda Beach in Sydney, July 16, 2014. Many of Sydney's famed beaches remain popular with surfers during the southern hemisphere winter months despite early sunsets and cooler ocean temperatures. (Photo by Jason Reed/Reuters)

Israeli security personnel look at a window damaged by shrapnel after a short-range rocket landed on Tuesday near the Erez crossing July 16, 2014. An Israeli civilian was killed by the rocket fired from the Gaza Strip on Tuesday, the military said, the first Israeli fatality in more than a week of fighting with Palestinian militants. The Islamist group Hamas that rules Gaza claimed responsibility for launching the short-range rocket that struck an area along the border with Gaza. (Photo by Finbarr O'Reilly/Reuters)

A boy casts his fishing line on the bank of Lake Ohrid in village of Trpejica during a stormy evening July 16, 2014. (Photo by Ognen Teofilovski/Reuters)

Bosnian Muslims carry coffins with bodies from a mass grave, before a mass funeral in Kozarac, near Prijedor, July 19, 2014. The collective burial of 284 Bosnian Muslims and Croats, whose remains were found and identified in a northwestern mass grave and believed to be the largest from Bosnia's 1992-95 war, will take place on Sunday. (Photo by Dado Ruvic/Reuters)

An Israeli tank manoeuvres outside the northern Gaza Strip July 21, 2014. The Palestinian death toll in an Israeli offensive in the Gaza Strip jumped to more than 500 on Monday, as the United States, alarmed by escalating civilian bloodshed, took a direct role in efforts to secure a ceasefire. Israel's losses also mounted. Following the death of 13 soldiers on Sunday, Israel said seven more troops had died on Monday, including four killed when a group of militants tunnelled across the border from Gaza and fired at their jeep. (Photo by Baz Ratner/Reuters)

A couple look at stone sculptures at the Remic Rapids in the Ottawa River during sunset at Ottawa July 23, 2014. (Photo by Chris Wattie/Reuters)

Louis Reboul of France competes during the Swatch Prime Line Mountainbike finale at Munich Olympic Park in Munich, Germany, on Jule 20, 2014. (Photo by Alexander Hassenstein/Bongarts/Getty Images)

A man works on painting an atrium at the World Financial Center in New York, New York, USA, 11 July 2014. (Photo by Justin Lane/EPA)

A model walks down the runway wearing swimwear from the Luli Fama collection during the Mercedes-Benz Fashion Week Swim show, Sunday, July 20, 2014, in Miami Beach, Fla. (Photo by J. Pat Carter/AP Photo)

Chen Aisen of China competes in the team event of the 19th FINA Diving World Cup at the Oriental Sports Center on July 15, 2014 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

A Kayaker paddles near the Frankston foreshore as the sun sets over the low lying cloud of fog on July 22, 2014 in Melbourne, Australia. Low temperatures and heavy fog hit Melbourne on Tuesday morning and again on Wednesday, causing Tuesday's flight delays. (Photo by Michael Dodge/Getty Images)

Russell Brown, of Los Altos, Calif., watches the sunrise from a a hill in the Marin Headlands on Monday, July 14, 2014, in San Francisco. (Photo by Marcio Jose Sanchez/AP Photo)

A woman looks at a projected stills image of a 1915 British munitions factory during a photocall to launch the Imperial War Museum's new First World War Galleries Atrium in London, on July 16, 2014. The First World War Galleries tell the story of the war and feature over 1,300 objects from diaries and personal mementos through to weapons, posters and film. The exhibition opens to the public on July 19, 2014. (Photo by Ben Stansall/AFP Photo)

A photo made available 24 July 2014 of a young man who appears to fly in the air while being backdropped by a dramatic constallation of clouds as he jumps from a tower at a public bathing beach into the Lake Ammersee, in Utting, Bavaria state, Germany, 23 July 2014. (Photo by Karl-Josef Hildenbrand/EPA)

Sunrise silhouettes the U.S. flags surrounding the Washington Monument in Washington, Wednesday, July 9, 2014, on a cloudy morning in the nation's capital. (Photo by J. David Ake/AP Photo)

Photographers from the Museum of Contemporary Art Jacksonville photography camp take pictures from the 42nd floor of the Bank of America tower on Thursday, July 10, 2014, in Jacksonville, Fla. The young photographers are spending about half their time shooting pictures and the other half on the computer learning Photoshop techniques. Mario Peralta, their instructor, says the campers have been working on a variety of assignments including; collages, silhouettes, textures and multiple exposures. (Photo by Bruce Lipsky/AP Photo/Florida Times-Union)

The Saints run onto the field during the round 16 AFL match between the Carlton Blues and the St Kilda Saints at Etihad Stadium in Melbourne, Australia, on Jule 6, 2014. (Scott Barbour/Getty Images)

A Filipino boy plays inside a large metal tube that will be used to repair an old bridge in suburban Malabon, north of Manila, Philippines, Tuesday, July 22, 2014. (Photo by Aaron Favila/AP Photo)

A mother with her child is silhouetted as she visits the graves of Greek and Cypriot soldiers killed in the 1974 Turkish invasion of Cyprus, at the Tymvos Macedonitissas military cemetery in Nicosia, Cyprus, 17 July 2014. Greek and Cypriot soldiers were killed in 1974, 40 years ago, during the Turkish invasion and subsequent occupation of the northern part of the island of Cyprus. The 20 July 2014, marks the 40th anniversary of Turkish invasion. Cyprus was split into Greek Cypriot south and Turkish Cypriot north in 1974 when Turkey invaded in response to a coup by supporters of union with Greece. (Photo by Katia Christodoulou/EPA)

An Indian boy plays along a waterlogged street in Allahabad on July 19, 2014. The southwest monsoon covered the entire country on July 17, two days behind the normal schedule. (Photo by Sanjay Kanojia/AFP Photo)

Children play with a sprinkler at a playground in the Park Slope section of the Brooklyn borough of New York July 7, 2014. (Photo by Brendan McDermid/Reuters)

People watch the sunset under the Manette Bridge near the Boat Shed Restaurant in Bremerton, Wash., Sunday, July 13, 2014. (Photo by Larry Steagall/AP Photo/Kitsap Sun)

A stroller with umbrella walks on a landing stage at Lake Steinhuder Meer near Mardorf, northern Germany Friday July 25, 2014. Weather forecasts predict changeable weather for the next few days. (Photo by Alexander Koerner/AP Photo/DPA)

Young players of Planaltina football club practise in Planaltina July 3, 2014. In a project called “On The Sidelines”, Reuters photographers share pictures showing their own quirky and creative view of the 2014 World Cup in Brazil. (Photo by Damir Sagolj/Reuters)