A man smokes marijuana as marijuana enthusiasts gather after midnight to celebrate the legalization of recreational use of marijuana in Portland, Oregon July 1, 2015. Smoking and growing small amounts of marijuana became legal in Oregon on Wednesday, as a growing legalization movement spread down the United States' west coast. A law allowing recreational use, backed by voters in November, came into effect at midnight, opening the way for marijuana to be sold in shops by next year – though some lawmakers say they will still try to block retail outlets. (Photo by Steve Dipaola/Reuters)

Southern California storm chasing photographers take pictures of the mass lightning bolts lighting up night skies from monsoon storms passing over the high deserts, early Wednesday north of Barstow, California, July 1, 2015. Picture taken using long exposure. (Photo by Gene Blevins/Reuters)

Mass lightning bolts light up night skies by Daggett airport from monsoon storms passing over the high deserts early Wednesday, north of Barstow, California, July 1, 2015. Picture taken using long exposure. (Photo by Gene Blevins/Reuters)

Mass lightning bolts light up night skies by Daggett airport from monsoon storms passing over the high deserts early Wednesday, north of Barstow, California, July 1, 2015. Picture taken using long exposure. (Photo by Gene Blevins/Reuters)

Two policemen guard Palais Coburg, the venue for nuclear talks in Vienna, Austria, July 1, 2015. Iran and six world powers gave themselves an extra week to reach a final nuclear accord after it became clear they would miss a deadline on Tuesday, with U.S. and Iranian officials sounding upbeat even though obstacles remain. (Photo by Leonhard Foeger/Reuters)

Actress Bai Ling poses for a picture in front of St. Basil's Cathedral at the Red Square in Moscow, Russia, July 1, 2015. (Photo by Ivan Burnyashev/Reuters)

People swim en masse at the start of the annual public Lake Zurich crossing swimming event in Zurich July 1, 2015. The participants crossed Lake Zurich over a distance of 1,500 metres (4,921 ft). (Photo by Arnd Wiegmann/Reuters)

People swim during the annual public Lake Zurich crossing swimming event in Zurich July 1, 2015. (Photo by Arnd Wiegmann/Reuters)

Members of the Military Police for Public Order (PMOP) patrol the impoverished Flor del Campo neighbourhood in Tegucigalpa, Honduras, April 29, 2015. Since taking office in January 2014, Honduras' President Juan Orlando Hernandez has delegated the intelligence and counternarcotics operations to the military, creating the Military Police for Public Order, a new force that patrols violent neighbourhoods, public schools and playgrounds to curb violence, amidst growing claims of human rights abuses. (Photo by Jorge Cabrera/Reuters)

A communal worker tends a flowerbed, displaying the Ukrainian coat of arms, in central Kiev, Ukraine, July 1, 2015. (Photo by Gleb Garanich/Reuters)

A man watches a television broadcast of U.S. President Barack Obama speaking, in Havana, Cuba July 1, 2015. Obama said on Wednesday the United States has agreed to the historic step of re-establishing diplomatic relations with Cuba, and will raise its flag over a U.S. Embassy in Havana this summer. (Photo by Enrique de la Osa/Reuters)

A giant Grand Depart logo of the Tour de France cycling race in Utrecht is seen in front of Utrecht Centraal train station, Netherlands, July 1, 2015. The 2015 Tour de France cycling race will start in Utrecht, Netherlands, on Saturday July 4. (Photo by Benoit Tessier/Reuters)

A U.S. government contractor wheels out parts needed to begin the initial installation of security spikes (on cart) on the existing White House perimeter fence in Washington, United States, July 1, 2015. The White House fence will start to get a spiked top on Wednesday in a short-term bid to thwart intrusions at the U.S. executive mansion, authorities said. The “removable anti-climb feature” with sharp metal points will be bolted on top of the black iron fence by the U.S. Secret Service and National Park Service, the agencies said in a statement on Tuesday. (Photo by Gary Cameron/Reuters)

U.S. government contractors begin the initial installation of security spikes on the existing White House perimeter fence in Washington, United States, July 1, 2015. (Photo by Gary Cameron/Reuters)

A U.S. government contractor begins the initial installation of security spikes on the existing White House perimeter fence in Washington, United States, July 1, 2015. (Photo by Gary Cameron/Reuters)

A man walks past a capsized ship at a marina in the town of Elefsina, near Athens, Greece June 30, 2015. In a poll released on July 1, 54 percent of Greeks showed that they would heed the advice of leftist Greek Prime Minister Alexis Tsipras and vote in the Greek referendum against new tough conditions for financial aid in the hope that creditors would compromise. (Photo by Marko Djurica/Reuters)

Yulia Putintseva of Kazakhstan slips during her match against Venus Williams of the U.S.A. at the Wimbledon Tennis Championships in London, July 1, 2015. (Photo by Henry Browne/Reuters)

Volunteers prepare rations at a charity food assistance center they run in Yemen's capital Sanaa July 1, 2015. (Photo by Khaled Abdullah/Reuters)

Girls wait for food rations outside a charity food assistance center in Yemen's capital Sanaa July 1, 2015. (Photo by Khaled Abdullah/Reuters)

Google Executive Chairman Eric Schmidt (R) holds the door open as Brazil President Dilma Rousseff (2nd R) takes a seat in a self-driving car at Google Headquarters in Mountain View, California, July 1, 2015. (Photo by Beck Diefenbach/Reuters)

Greek Finance Minister Yanis Varoufakis arrives on his motorbike prior to a meeting at the office of Prime Minister Alexis Tsipras in Maximos Mansion in Athens, Greece, July 1, 2015. Prime Minister Alexis Tsipras called on Greeks to vote “no” in Sunday's referendum on a bailout package offered by creditors, in a defiant address that dispelled speculation he was rowing back on the plan under mounting pressure. (Photo by Jean-Paul Pelissier/Reuters)

Skiers are pictured on artificial snow at the El Colorado ski centre at Los Andes Mountain range, near Santiago, Chile, July 1, 2015. Due to a severe drought, the ski centre uses artificial snow machines to keep the ski slopes ready for tourists and residents. (Photo by Ueslei Marcelino/Reuters)

A snowman is seen at the El Colorado ski centre at Los Andes Mountain range, near Santiago, Chile, July 1, 2015. (Photo by Ueslei Marcelino/Reuters)

Tourists use the chairlift at the El Colorado ski centre at Los Andes Mountain range, near Santiago, Chile, July 1, 2015. (Photo by Ueslei Marcelino/Reuters)

Colombian tourists take pictures at the El Colorado ski centre at Los Andes Mountain range, near Santiago, Chile, July 1, 2015. (Photo by Ueslei Marcelino/Reuters)

Actor Paul Rudd attends the ceremony for the unveiling of his star on the Walk of Fame in Hollywood, California July 1, 2015. (Photo by Mario Anzuoni/Reuters)

A police officer watches a screen during a news conference to illustrate an anti-terrorism operation, at the Police headquarters in Milan, Italy, Wednesday, July 1, 2015. Italian anti-terrorism police on Wednesday arrested several family members of a married couple who traveled to Syria to join the Islamic State group and were allegedly trying to persuade their relatives to join them, officials said. (Photo by Luca Bruno/AP Photo)

Supporters of the Muslim Brotherhood and bystanders run away from the Egyptian security forces during clashes following their protest on a street in Cairo's Matariya district, Egypt, Tuesday, June 30, 2015. Protesters were marching on a Cairo street Tuesday as authorities has declared the day a national holiday, two years after the mass protests that preceded the overthrow of President Mohammed Morsi. (Photo by Belal Darder/AP Photo)

A woman passes a banner supporting the NO vote to the upcoming referendum at the Finance Ministry in Athens, Wednesday, July 1, 2015. Greece's government appeared to be caving into demands from its creditors on Wednesday, offering concessions in a desperate attempt to get more aid hours after its bailout program expired. (Photo by Daniel Ochoa de Olza/AP Photo)

A woman takes a photograph of a banner supporting the NO vote to the upcoming referendum at the Finance Ministry in Athens, Wednesday, July 1, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

An Iranian woman walks a street of the capital Tehran, Iran, 01 July 2015. Iran and six world powers on 30 June set a new July 7 deadline for reaching a wide-ranging deal over Iran's controversial nuclear program, signaling that they have yet to bridge several key differences in negotiations. (Photo by Abedin Taherkenareh/EPA)

An employee of the National Bank of Greece (C) distributes priority tickets to pensioners outside a bank branch in central Athens, Greece, 01 July 2015. Pensioners who do not own an ATM card line up to enter in a bank branch to withdraw part of their pension, limit up 120 euros, as a result of capital controls imposed by the Greek government. The Greek government on 30 June presented a last-minute proposal for a two-year agreement with the European Stability Mechanism (ESM) to fully cover its financing needs, combined with debt restructuring. “From the first we made clear that the decision to call a referendum was not the end but the continuation of a negotiation seeking better terms for the Greek people”, an announcement from the office of Prime Minister Alexis Tsipras said. (Photo by Yannis Kolesidis/EPA)

Winner Cevin Chan on Kazzi (L) in action during the galopp competition at the derby week in Hamburg, Germany, 30 June 2015. (Photo by Axel Heimken/EPA)

A member of the Swedish circus company Cirkus Cirkor performs during their show “Knitting Peace”, at Las Condes Municipal Theater in Santiago, Chile, 30 June 2015. The circus will be performing in Chile from 01 to 12 July. (Photo by Javier Valdes/EPA)

Performers in medieval costumes take part in the procession of “Ommegang”, at the Grand Place in Brussels, Belgium, 30 June 2015. Ommegang is Brussels' traditional pageant to reenact the entry of Holy Roman Emperor Charles V. (Photo by Julien Warnand/EPA)

A tourists is seen in silhouette in front of the Matterhorn mountain on June 30, 2015 in Riffelalp above Zermatt. The alpine resort celebrates this year the 150 anniversary of Matterhorn's first climb. (Photo by Fabrice Coffrini/AFP Photo)

Wild horses relax on a beach near sunbathers on Assateague Island, Maryland on June 30, 2015.The horses on the island are decedents of domestic animals, that have reverted to a wild state most likely because they were first brought to the barrier island in the late 17th century by mainland owners to avoid fencing laws and taxation of livestock, according to the National Park service. (Photo by Andrew Caballero-Reynolds/AFP Photo)

Indian paramilitary soldiers patrol in Srinagar, Indian controlled Kashmir, Wednesday, July 1, 2015. The wide-ranging powers granted to Indian soldiers in Kashmir have fuelled a cycle of impunity for human rights violations in the troubled Himalayan region, Amnesty International said Wednesday. (Photo by Dar Yasin/AP Photo)

Children play in the Salmon Street Springs fountain in Portland, Ore., Wednesday, July 1, 2015. A heat advisory is in effect for Portland from noon Wednesday to 8 p.m. Thursday, according to the national weather service. (Photo by Don Ryan/AP Photo)

Tribal dancers entertain Burundians in Bujumbura, Burundi, Wednesday July 1, 2015. Burundi celebrated its 53rd Independence Day on Wednesday, as the country awaits results of parliamentary elections marked by an opposition boycott and the threat of violence in the capital. (Photo by Berthier Mugiraneza/AP Photo).

President Barack Obama jogs back to his limo in the heavy rain after he arrived, Wednesday, July 1, 2015, in Nashville, Tenn. The president is scheduled to speak at an elementary school regarding the Affordable Care Act. (Photo by Sanford Myers/AP Photo)

Ebola health workers spray disinfectant on a road near the home of a 17-year old boy that died from the Ebola virus on the outskirts of Monrovia, Liberia, Wednesday, July 1, 2015. Liberian officials confirmed a second Ebola case Wednesday in the same town where the disease was detected days earlier from the corpse of a teenager, seven weeks after the country was declared Ebola-free.(Photo by Abbas Dulleh/AP Photo)

Dutch Finance Minister and chair of the eurogroup Jeroen Dijsselbloem walks to the Ministry of Finance to attend a conference call of the 19 eurozone finance ministers to discuss a new bailout request from the Greek government in The Hague, Netherlands Wednesday, July 1, 2015. (Photo by Phil Nijhuis/AP Photo)

A balloon flies during the I Azores hot air balloon festival “Feel the Sky”, Ribeira Grande, Sao Miguel Island, Azores, Portugal, 01 July 2015. Twenty ballooning teams from several countries are taking part in the event. (Photo by Eduardo Costa/EPA)

Shania Twain performs onstage at Madison Square Garden on June 30, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images)