A trader furrows his brow as he works on the floor of the New York Stock Exchange in New York, June 24, 2015. Investors are braced for further reaction on world stock markets after Greece closed its banks and imposed capital controls on Sunday to check the growing strains on its crippled financial system, bringing the prospect of being forced out of the euro into plain sight. After bailout talks between the leftwing government and foreign lenders broke down at the weekend, the European Central Bank froze vital funding support to Greece's banks, leaving Athens with little choice but to shut down the system to keep the banks from collapsing. Across the Atlantic, photos of the hands, faces and expressions of traders at the New York Stock Exchange show the tension of tracking the markets and their reaction to fast-moving stories affecting investor sentiment. REUTERS/Lucas Jackson

PICTURE 10 OF 30 FOR WIDER IMAGE STORY "NYSE - UP CLOSE AND IN DETAIL". SEARCH "LUCAS EXPRESSIONS" FOR ALL IMAGES 

Doreen Lawrence, mother of murdered teenager Stephen Lawrence, furrows her brow as she speaks to members of the media after Gary Dobson and David Norris were sentenced for his murder at the Old Bailey, the Central Criminal Court in London January 4, 2012. Two men who took part in the murder of black teenager Stephen Lawrence in 1993 -- a landmark case which exposed what an inquiry called the "institutional racism" of London's police force -- were given life sentences on Wednesday. REUTERS/Luke MacGregor (BRITAIN - Tags: CRIME LAW SOCIETY) 

Italy's Prime Minister Silvio Berlusconi leaves an European Union leaders summit in Brussels, December 17, 2010. European Union leaders have agreed to try to lengthen the maturities of new sovereign bond issues, a draft statement from the EU's summit showed on Friday. REUTERS/Eric Vidal (BELGIUM - Tags: POLITICS BUSINESS) 

French President Nicolas Sarkozy reacts as he listens to Ireland's Prime Minister Brian Cowen (L) and Danish Prime Minister Lars Lokke Rasmussen (R) during an European Union leaders summit in Brussels December 17, 2010. EU leaders have agreed to try to lengthen the maturities of new sovereign bond issues, a draft statement from the EU's summit showed on Friday. REUTERS/Francois Lenoir (BELGIUM - Tags: POLITICS BUSINESS IMAGES OF THE DAY) 

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to film or take pictures in Tehran.

An Iranian man shouts anti-U.S. and anti-Israel slogans during Friday prayers in Tehran October 22, 2010. REUTERS/Caren Firouz (IRAN - Tags: SOCIETY RELIGION) 

A woman wearing a niqab stands in front of the Parliament building during a protest in Sarajevo July 26, 2010. Bosnia's Council of Ministers will meet on Tuesday to consider passing a law prohibiting the wearing of the niqab. REUTERS/Danilo Krstanovic (BOSNIA AND HERZEGOVINA - Tags: RELIGION POLITICS CIVIL UNREST) 

Argentina's coach Diego Maradona pauses on the field before the 2010 World Cup quarter-final soccer match against Germany at Green Point stadium in Cape Town July 3, 2010. REUTERS/Carlos Barria (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Cast member Robert Pattinson poses at the premiere of "The Twilight Saga: Eclipse" during the Los Angeles Film Festival at Nokia theatre at L.A. Live in Los Angeles June 24, 2010. The movie opens in the U.S. on June 24. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) 

Fenerbahce's Brazilian player Alex reacts after missing a goal chance against Trabzonspor during their Turkish Super League soccer match at Sukru Saracoglu stadium in Istanbul May 16, 2010. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SOCCER) 

Gael Monfils of France reacts as he plays against Rafael Nadal of Spain during their Madrid Open quarter-final tennis match May 14, 2010. REUTERS/Andrea Comas (SPAIN - Tags: SPORT TENNIS) 

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.

A member of Iran's Revolutionary guard stands at attention during an anti-U.S. ceremony in Azadi (freedom) Square in Tehran April 25, 2010. A ceremony organized by Iran's Revolutionary guard marks the anniversary of the failed U.S. operation to rescue U.S. hostages in Iran in 1980. REUTERS/Morteza Nikoubazl (IRAN - Tags: ANNIVERSARY POLITICS) 

Britain's Foreign Secretary David Miliband gestures as he arrives for the European Informal Meeting of Foreign Affairs Ministers at the Viana Palace in Cordoba, southern Spain, March 5, 2010. REUTERS/Javier Barbancho (SPAIN - Tags: POLITICS IMAGES OF THE DAY) 

First lady Michelle Obama listens to students explain harvesting lettuce at Hollin Meadows Science and Math Focus School in Alexandria, Virginia November 18, 2009. She visited the school to highlight the USDAO's Healthier U.S. Schools Challenge focusing on three core principles: nutritious meals, nutrition education, and physical education. REUTERS/Molly Riley (UNITED STATES POLITICS EDUCATION AGRICULTURE) 

Spanish Prime Minister Jose Luis Rodriguez Zapatero smiles as he bids farewell to Spanish King Juan Carlos (not pictured) after attending the wake of Spanish writer Francisco Ayala at a funeral home in Madrid November 4, 2009. Ayala, one of the most well-known writers in the Spanish language, died November 3, 2009, in Madrid at the age of 103. REUTERS/Susana Vera (SPAIN OBITUARY ROYALS SOCIETY IMAGES OF THE DAY) 

Actor George Clooney poses for photographers during a red carpet for the premiere of the movie "The Men Who Stare At Goats" at the 66th Venice Film Festival September 8, 2009. REUTERS/Tony Gentile (ITALY ENTERTAINMENT) 

U.S. President Barack Obama leaves the Sweet Life Cafe after dinner there with friends in Oak Bluffs on Martha's Vineyard August 25, 2009. REUTERS/Jason Reed (UNITED STATES POLITICS IMAGES OF THE DAY) 

An Afghan man walks in the bazaar of Faizabad in the northeastern province of Badakhshan August 13, 2009. REUTERS/Caren Firouz (AFGHANISTAN SOCIETY) 

A handicapped man sits waiting for handouts street-side in Kabul August 12, 2009. REUTERS/Adrees Latif (AFGHANISTAN SOCIETY IMAGES OF THE DAY) 

A reveller attends a "Music against the racism" concert during Budapest's one-week, round-the-clock Sziget ('Island') music festival on an island on the Danube river August 11, 2009. REUTERS/Karoly Arvai (HUNGARY ENTERTAINMENT SOCIETY IMAGES OF THE DAY) 

A woman listens during an event for women to discuss the presidential candidates in Kabul August 11, 2009. Afghanistan's presidential election will be held on August 20. REUTERS/Lucy Nicholson (AFGHANISTAN POLITICS ELECTIONS) 

The grandmother of Fadi Hamadne gestures towards members of the media at her home in the West Bank village of Asira Ash-Shamaliya near Nablus August 10, 2009. A Hamas prisoner, Fadi Hamadne, who committed suicide while in custody of Palestinian President Mahmoud Abbas's security forces in the West Bank had been tortured, the Islamist group said on Monday. Palestinian security officials said 28-year-old Hamadne hung himself in his cell. REUTERS/Abed Omar Qusini (WEST BANK POLITICS CONFLICT IMAGES OF THE DAY) 

A woman struggles with strong wind brought by typhoon Morakot in Taipei August 7, 2009. The mid-strength typhoon, the most severe this year so far, began enveloping Taiwan on Friday, cancelling flights and closing ports with wind gusts up to 180 kph (112 mph) before heading to China. REUTERS/Pichi Chuang (TAIWAN ENVIRONMENT IMAGES OF THE DAY) 

Boys wait in line for supplies distributed by the Afghan national army in Chapadara at the Pech Valley in Kunar Province August 6, 2009. Afghanistan's presidential elections will be held on August 20. REUTERS/Carlos Barria (AFGHANISTAN POLITICS ELECTIONS) 

U.S. Secretary of State Hillary Clinton is assisted by a technician in adjusting her translation device during a news conference at the U.S. embassy in Kenya's capital Nairobi, August 6, 2009. Clinton pledged strong support for Somalia's fragile government on Thursday and said that Eritrean interference in the Horn of Africa nation was "unacceptable". REUTERS/Thomas Mukoya (KENYA POLITICS SOCIETY CONFLICT) 

A woman, who fled a military offensive against the Taliban in the Swat Valley region a few months earlier, sits amidst her belongings while returning home to her village through Malakand district, about 170 km (106 miles) north west by road of Pakistan's capital Islamabad July 30, 2009. REUTERS/Ali Imam (PAKISTAN CONFLICT POLITICS SOCIETY) 

Hmong hill tribe refugees sit in Ban Huay Nam Khao camp in Phetchabun province about 416 km (258 miles) northeast of Bangkok July 30, 2009. A total of 4,645 Hmong refugees who had fled Laos, settled in this village five year ago. The Thai authorities consider these people illegal immigrants and intend to return them to Laos. REUTERS/Sukree Sukplang (THAILAND POLITICS SOCIETY) 

A Hmong hilltribe refugee boy stands in Ban Huay Nam Khao camp in Phetchabun province about 416 km (258 miles) northeast of Bangkok July 30, 2009. A total of 4,645 Hmong refugees who had fled Laos, settled in this village five year ago. The Thai authorities consider these people illegal immigrants and intend to return them to Laos. REUTERS/Sukree Sukplang (THAILAND POLITICS SOCIETY IMAGES OF THE DAY) 

Three-time Olympic silver medallist swimmer Laszlo Cseh of Hungary shaves his head before competing at the World Championships in Rome July 28, 2009. REUTERS/Laszlo Balogh (ITALY SPORT SWIMMING) 

France's President Nicolas Sarkozy speaks at a news conference at the end of the first day of the G8 summit in L'Aquila, Italy, July 8, 2009. REUTERS/Philippe Wojazer (ITALY POLITICS) 

A supporter of ousted Honduran President Manuel Zelaya shouts after soldiers fired tear gas at the protest at the international airport in Tegucigalpa July 5, 2009. Zelaya turned back from an attempted return home on Sunday after soldiers clashed with his supporters as he tried to land, fueling tensions over the coup that toppled him.
REUTERS/Henry Romero(HONDURAS POLITICS CONFLICT) 

A broker reacts at a stock brokerage firm in Mumbai July 6, 2009. Indian shares fell more than 5 percent on Monday and the rupee dropped to its lowest in a week as new growth spending announced by the government fueled investor fears about the growing fiscal deficit, sending bond yields sharply higher. REUTERS/Arko Datta (INDIA BUSINESS) 

A Pashtun man looks out of the window of a bus as he waits at a checkpoint in Buner district, about 220 km (137 miles) northwest of Islamabad June 28, 2009. Nearly 2 million people have fled fighting in the northwest which intensified in late April when the army moved to push the Taliban out of Buner district before launching an offensive in Swat. Thousands of people have been returning to Buner since the government announced recently it was now safe for people to go home. REUTERS/Akhtar Soomro (PAKISTAN CONFLICT SOCIETY POLITICS) 

An internally displaced boy, who fled a military offensive in the Swat valley region, is photographed at the UNHCR (United Nations High Commission for Refugees) Jalozai camp, about 140 km (87 miles) northwest of Pakistan's capital Islamabad June 24, 2009. Inadequate assistance was allowing militant groups to operate in camps and communities housing hundreds of thousands of Pakistanis displaced by an offensive against the Taliban, an aid group said on Wednesday. REUTERS/Faisal Mahmood (PAKISTAN CONFLICT POLITICS SOCIETY) 

An internally displaced boy, who fled a military offensive in the Swat valley region, looks through a tear in the food distribution tent at the UNHCR (United Nations High Commission for Refugees) Jalozai camp, about 140 km (87 miles) north west of Pakistan's capital Islamabad June 24, 2009. Inadequate assistance was allowing militant groups to operate in camps and communities housing hundreds of thousands of Pakistanis displaced by an offensive against the Taliban, an aid group said on Wednesday. REUTERS/Faisal Mahmood (PAKISTAN CONFLICT POLITICS SOCIETY) 

Houston Astros catcher Ivan Rodriguez looks towards an unidentified person in the dugout during the first inning against the Texas Rangers in a game where he will set a new record for the most games played at the catcher position in baseball during their MLB interleague baseball game in Arlington, Texas June 17, 2009. REUTERS/Mike Stone (UNITED STATES SPORT BASEBALL IMAGES OF THE DAY) 

An internally displaced girl, who fled a military offensive in the Swat valley region, holds her ration of bread at the UNHCR (United Nations High Commissioner for Refugees) Sheik Yaseen camp in Mardan district, about 150 km (93 miles) northwest of Pakistan's capital Islamabad, June 17, 2009. REUTERS/Akhtar Soomro (PAKISTAN POLITICS CONFLICT SOCIETY) 

A man reads job offers posted at a job fair in Moscow May 26, 2009. Thousands of unemployed Russians crammed into the Moscow job fair on Tuesday, trying to shove their way into a reeling labour market where employers now hold all the cards. Russian unemployment has ballooned to 6.1 million, 8.1 percent of the economically active population. REUTERS/Denis Sinyakov (RUSSIA POLITICS EMPLOYMENT BUSINESS IMAGES OF THE DAY) 

A Myanmarese protester poses in front of the NLD (Liberated Area)'s flag during a demonstration in calling for democracy in Myanmar, outside the Myanmar embassy, in Kuala Lumpur May 15, 2009. REUTERS/Bazuki Muhammad (MALAYSIA SOCIETY CONFLICT) 

California Governor Arnold Schwarzenegger speaks at a news conference after being briefed on the Jesusita fire in Santa Barbara, California May 7, 2009. An out-of-control, wind-driven wildfire bore down on Santa Barbara on Wednesday, destroying some 20 homes in the rugged central California foothills, forcing thousands of residents to evacuate and injuring three firefighters. REUTERS/Mario Anzuoni (UNITED STATES DISASTER POLITICS ENVIRONMENT) 

Britain's Prime Minister Gordon Brown gestures during a visit to Prendergast Hilly Fields School in London May 5, 2009. Cutting back on investment is no way to get through the recession, Brown said on Tuesday. The Labour party and Conservatives are setting out their stalls on how to tackle the economic crisis and deal with ballooning government borrowing ahead of an election which must be called by June 2010. REUTERS/Peter Macdiarmid/Pool (BRITAIN POLITICS BUSINESS IMAGES OF THE DAY) 

A model presents a creation by Stand house design at the final day of the Rosemount Fashion Festival in central Sydney May 1, 2009. REUTERS/Daniel Munoz (AUSTRALIA FASHION) 

Elang, an Indonesian student, swims in polluted waters after school, at Pluit dam in Jakarta April 20, 2009. REUTERS/Beawiharta (INDONESIA ENVIRONMENT) 

European Central Bank (ECB) President Jean-Claude Trichet speaks during a news conference in Tokyo April 17, 2009. Trichet said on Friday the ECB must balance the need for immediate action to tackle a credit crunch with a sound exit strategy for such policies. REUTERS/Yuriko Nakao (JAPAN BUSINESS POLITICS) 

Female cadets take part in a demonstration at a military training school in Bogota March 21, 2009. Sixty-two female soldiers took part in the first ever course allowing them to pursue careers as combat officers in the army. Picture taken March 21, 2009. REUTERS/John Vizcaino (COLOMBIA MILITARY SOCIETY) 

An Afghan man looks on as Canadian soldiers from the NATO-led coalition take position in the Taliban stronghold of Arghandab district in Kandahar province, southern Afghanistan, March 30, 2009. REUTERS/Stefano Rellandini (AFGHANISTAN POLITICS MILITARY) 

Romania's President Traian Basescu (R) gestures before welcoming ceremony for his Serbian counterpart Boris Tadic (unseen) at Cotroceni presidential palace in Bucharest March 27, 2009. REUTERS/Bogdan Cristel (ROMANIA POLITICS) 

A trading specialist uses his handheld computer on the floor of the New York Stock Exchange, March 26, 2009. Stocks rose on Thursday, with the Nasdaq turning positive for the year, as a batch economic data that was not as dire as expected fed optimism the economy's worst days were behind it. REUTERS/Chip East (UNITED STATES BUSINESS) 

Italian writer Roberto Saviano, the author of "Gomorrah", looks on during an Italian television program "Che tempo che fa" in Milan March 25, 2009. Saviano is a symbol of the fight against the mafia since his best-selling book "Gomorra" exposed how the mob dominates life around Naples. The 29-year old has received death threats and lives under police escort. REUTERS/Alessandro Garofalo (ITALY ENTERTAINMENT SOCIETY CONFLICT) 

People look through bus windows at a crime scene where an assailant was killed during an attack on a bus in Guatemala City March 24, 2009. In three attacks around the city gunmen killed a passenger and wounded two bus drivers. Also, a private security guard shot and killed one attacker and wounded another. Attacks on bus drivers are common in Guatemala where organized gangs extort money from the private companies that run the buses. According to police nearly 200 bus drivers, driver's assistants and owners have been killed in the last year. REUTERS/Daniel LeClair (GUATEMALA CONFLICT POLITICS) 

Police detain a man during a protest outside the Isle of Grain power station in Rochester, southeast England, March 24, 2009. The Unite union claims that two sub-contractors at the project refused applications for work from British based workers. REUTERS/Andrew Winning (BRITAIN EMPLOYMENT BUSINESS POLITICS ENERGY) 

Mexico's Lorena Ochoa reacts after making par on the 18th hole during the second round of the LPGA MasterCard Classic golf tournament in Huixquilucan March 21, 2009. REUTERS/Daniel Aguilar (MEXICO SPORT GOLF IMAGE OF THE DAY TOP PICTURE) 

Stock trader Simone Wallmeier reacts on actual market development at the German stock exchange in Frankfurt, March 3, 2009. A key European share benchmark hit the lowest level in its near 12-year lifetime on Tuesday as financial and oil stocks led equities lower on concerns over the global economy. REUTERS/Kai Pfaffenbach (GERMANY) 

Canada's Finance Minister Jim Flaherty speaks to journalists on Parliament Hill in Ottawa February 25, 2009. REUTERS/Chris Wattie (CANADA) 

Kate Winslet reacts after winning the best actress Oscar for her work in "The Reader" during the 81st Academy Awards in Hollywood, California February 22, 2009. REUTERS/Gary Hershorn (UNITED STATES) (OSCARS-SHOW) 

Students are seen reflected in the sunglasses of Britain's Princess Anne as she visits a school at the bushfire-affected town of Wandong, 55km (34 miles) north of Melbourne February 23, 2009.
REUTERS/Mick Tsikas (AUSTRALIA) 

France's President Nicolas Sarkozy (L-R), Italy's Prime Minister Silvio Berlusconi and European Commission President Jose Manuel Barroso attend a news conference after a meeting in Berlin, February 22, 2009. European leaders met in Berlin on Sunday to agree a common stance on overhauling global financial rules but their summit risked being overshadowed by concerns about the fragility of euro zone and eastern European states. REUTERS/Tobias Schwarz (GERMANY) 

Moroccan boxer Naima Amjdo trains in a wood near Mohamedia February 11, 2009. Women's boxing in Morocco started in poor neighborhoods from Casablanca and Mohamedia and the Moroccan national women's boxing team was created in 2003, now there are approximately 100 female boxers in Morocco. REUTERS/Rafael Marchante(MOROCCO) 

A man looks at a large screen displaying India's benchmark share index on the facade of the Bombay Stock Exchange building in Mumbai February 16, 2009. Indian shares fell 3.4 percent on Monday, its biggest drop in two weeks, after an interim budget failed to provide a much needed impetus to struggling sectors such as construction and autos. REUTERS/Arko Datta (INDIA) 

AC Milan's David Beckham warms up before the Italian Serie A soccer match against Inter Milan at the San Siro stadium in Milan February 15, 2009. REUTERS/Tony Gentile (ITALY) 

A man gets his eyes tested at a free eye-care camp set up by voluntary organisation Karm in Mumbai February 15, 2009. According to a World Health Organisation report, 90 percent of the world's blind people live in developing countries with at least 9 million of them in India, where they are often the victims of poverty and lack of access to quality eye care. REUTERS/Arko Datta (INDIA)