An injured Iraqi officer waits for treatment on the front line during clashes with Islamic State extremists in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Tuesday, March 31, 2015. Iraqi forces battled Islamic State militants holed up in downtown Tikrit, going house to house Tuesday in search of snipers and booby traps, and the prime minister said security forces had reached the heart of the city. (Photo by Khalid Mohammed/AP Photo)

Burmese fishermen raise their hands as they are asked who among them want to go home at the compound of Pusaka Benjina Resources fishing company in Benjina, Aru Islands, Indonesia, Friday, April 3, 2015. Hundreds of foreign fishermen on Friday rushed at the chance to be rescued from the isolated island where an Associated Press report revealed slavery runs rampant in the industry. Indonesian officials investigating abuses offered to take them out of concern for the men's safety. (Photo by Dita Alangkara/AP Photo)

A station attendant stretches out to open a door for a passenger to get in a train car at a station in Kawasaki, near Tokyo, during a morning rush hour, Monday, March 30, 2015. (Photo by Shuji Kajiyama/AP Photo)

A human statue street artist takes a break to look at his cellphone in Madrid, Spain, Sunday, March 29, 2015. (Photo by Paul White/AP Photo)

Brendan Paul plays the part of Jesus during a re-enactment of the crucifixion of Christ in Sydney, Friday, April 3, 2015. Members of the Wesley Mission use a modern interpretation of the recreation of Jesus' journey to the cross before a Good Friday service is held. (Photo by Rick Rycroft/AP Photo)

Rugby fans dress as Stormtroopers, the character from movie “Star Wars” during a second day match of the Hong Kong Sevens rugby tournament in Hong Kong, Saturday, March 28, 2015. (Photo by Kin Cheung/AP Photo)

Rugby fans gather to watch the second day matchs of the Hong Kong Sevens rugby tournament in Hong Kong, Saturday, March 28, 2015. (Photo by Kin Cheung/AP Photo)

Rugby fans dance during a second day match of the Hong Kong Sevens rugby tournament in Hong Kong, Saturday, March 28, 2015. (Photo by Kin Cheung/AP Photo)

Rugby fans dress as the Japanese cat character “Maneki-neko” during the second day match of the Hong Kong Sevens rugby tournament in Hong Kong, Saturday, March 28, 2015. (Photo by Kin Cheung/AP Photo)

Believers carry a cross during heavy rain at the Palm Sunday procession in the old town of Heiligenstadt, central Germany, Sunday, March 29, 2015. The procession takes place with life-size figures from the Passion of Christ and under the presence of several thousand people. (Photo by Jens Meyer/AP Photo)

A Brazilian soccer fan waves her nations flag as she wait for the start of the international friendly soccer match soccer match between Brazil and Chile at the Emirates stadium in London, Sunday, March 29, 2015. (Photo by Kirsty Wigglesworth/AP Photo)

A man dressed as the Easter Bunny waves from an helicopter as he arrives to Urca Hill in Rio de Janeiro, Brazil, Wednesday, April 1, 2015. The Easter Bunny arrived for an event with children. (Photo by Silvia Izquierdo/AP Photo)

Indonesian models with gas masks wear dresses by Hanna Farhana (C) and Felicia Budi (L and R) during a fashion show in a polluted river basin planted mostly with rice in Rancaekek district near Citarum river located in western Java island as part of a campaign by environmental organization Greenpeace for top international fashion brands to remove toxic chemicals from their supply chains in Indonesia and address water pollution. (Photo by Romeo Gacad/AFP Photo)

A model displays a 100.20-carat diamond, left, and a 25.59-carat Burmese ruby during a media preview for the Sotheby's auction in Hong Kong Friday, April 3, 2015. The diamond, a 100.20-carat perfect D color, internally flawless, Type IIa stone in a classic emerald-cut, will be offered in New York Sotheby's auction house on April 21, when it is estimated to sell for US$19-25 million. The 25.59-carat Burmese ruby, cushion-shaped in “pigeon's blood” color, mounted as a ring, will be offered in Geneva Sotheby's auction house on May 12, when it is estimated to sell for US$12-18 million. (Photo by Kin Cheung/AP Photo)

A model displays both a 100.20 carats (L) and a 25.59 carats, that is known as “The Sunrise Ruby”, diamond rings at a pre-auction viewing at Sotheby's in Hong Kong April 3,2015. According to a press release by Sotheby's, the 100.20 carats diamond, described as “internally flawless” by Sotheby's, is expected to fetch between $19-25 million in a New York auction on April 21, 2015. The Burmese cushion-shaped ruby diamond “The Sunrise Ruby”, mounted by Cartier as a ring, is expected to fetch between $12-18 million in Geneva on May 12, 2015. (Photo by Tyrone Siu/Reuters)

Stanford cheerleaders perform during a women's college basketball regional semifinal game against Notre Dame in the NCAA Tournament, Friday, March 27, 2015, in Oklahoma City. (Photo by Sue Ogrocki/AP Photo)

A woman dressed as an anime character poses for photographers during the Otaku Summit in Chiba, suburb of Tokyo, on March 28, 2015. Japan opened what organisers are billing as the world's first “Otaku” summit on March 28, drawing visitors from around the world as the country looks to boost the international fan base for Japanese comic books and anime. (Photo by Toru Yamanaka/AFP Photo)

A man digs a gutter to drain water from his house after heavy rainfall caused the overflowing of the Copiapo river and the flooding of parts of the city in northern Chile, on March 30, 2015. At least 17 people were killed in flash floods that hit a normally arid region of northern Chile last week, and about the same number remain missing, authorities said Monday. (Photo by Patricio Miranda/AFP Photo)

An Iraqi soldier plays his guitar atop his armored vehicle on the main road between Baghdad and Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Friday, April 3, 2015. (Photo by Khalid Mohammed/AP Photo)

The sculpture “Untitled (Picasso)” made from colored glass fibre fabric by Italian artist Maurizio Cattelan is on display in the exhibition “Picasso in Contemporary Art” at the Deichtorhallen exhibition hall in Hamburg, Germany, March 30, 2015. The exhibition on the impact of Spanish artist Pablo Picasso on art featuring 200 works by renowned contemporary artists runs from April 1st to July 12th. (Photo by Malte Christians/EPA)

A woman kneels as she places a decorated wooden cutout on the lawn of the Garfield County Courthouse Wednesday April 1, 2015 in Enid, Okla. Two hundred thirty-nine cutouts were placed on the lawn by the Garfield County Child Advocacy representing the number of child abuse cases in Garfield County last year. (Photo by Billy Hefton/AP Photo/Enid News & Eagle)

A Houthi Shiite rebel carries his weapon as he joins others to protest against Saudi-led airstrikes, during a rally in Sanaa, Yemen, Wednesday, April 1, 2015. Saudi-led coalition warplanes bombed Shiite rebel positions in both north and south Yemen early Wednesday, setting off explosions and drawing return fire from anti-aircraft guns. (Photo by Hani Mohammed/AP Photo)

A member of the Iraqi security forces runs to plant the national flag as they surround Tikrit during clashes to regain the city from Islamic State militants, 80 miles (130 kilometers) north of Baghdad, Iraq, Monday, March 30, 2015. (Photo by Khalid Mohammed/AP Photo)

Iraqi security forces launch a rocket against Islamic State extremist positions during clashes in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Monday, March 30, 2015. (Photo by Khalid Mohammed/AP Photo)

People greet US military convoys at the border crossing in Bohumin, central Moravia, Czech Republic on March 29, 2015. Three US military convoys enter Czech Republic at border crossings in Bohumin, Nachod and Harrachov on the way from Baltic countries to base in Vilseck, Germany. (Photo by Radek Mica/AFP Photo)

Roman Catholic clergymen carry palm fronds during the Palm Sunday procession at Church of the Holy Sepulchre, traditionally believed by many to be the site of the crucifixion and burial of Jesus Christ, in Jerusalem's Old City, Sunday, March 29, 2015. Palm Sunday marks for Christians Jesus Christ's entrance into Jerusalem when his followers laid palm branches in his path, prior to his crucifixion. (Photo by Oded Balilty/AP Photo)

Smoke rises from a fire at a liquid bulk storage facility near Brazil's port of Santos, Thursday, April 2, 2015. The fire broke out Thursday morning at the facility owned by Ultracargo, one of Brazil's largest liquid bulk storage companies. Fuels, chemicals, vegetable oils, ethanol and corrosive products are stored at the site. The Santos fire department said there are no fatalities and that two workers were treated for smoke inhalation. (Photo by Andre Penner/AP Photo)

Iraqi security forces launch rockets against Islamic State extremist positions in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Saturday, March 28, 2015. The Iraqi troops pressed their push in the city Saturday against IS militants holed up in the center of the city. (Photo by Khalid Mohammed/AP Photo)

Olga Kurylenko poses for photographers during the 20th Jameson Empire Film Awards at the Grosvenor Hotel in central London, Sunday March 29, 2015. (Photo by Joel Ryan/Invision/AP Photo)

An elderly Nigerian woman arrives to validate her voting card using a fingerprint reader, prior to casting her vote later in the day, in the home town of opposition candidate Gen. Muhammadu Buhari, in Daura, Nigeria Saturday, March 28, 2015. Nigerians went to the polls Saturday in presidential elections which analysts say will be the most tightly contested in the history of Africa's richest nation and its largest democracy. (Photo by Ben Curtis/AP Photo)

Palestinian protesters throw stones toward Israeli army soldiers in front of the Israeli settlement of Beitar Illit during clashes that erupted following a protest marking Land Day, in the village of Wadi Fukin, near the West Bank city of Bethlehem, Monday, March 30, 2015. Land Day commemorates riots on March 30, 1976, when six people were killed during a protest by Israeli Arabs whose property was annexed in northern Israel to expand Jewish communities. (Photo by Mahmoud Illean/AP Photo)

Japan Airlines Co. (JAL) group companies' new employees practice before releasing paper planes during an initiation ceremony at the company's hangar near Haneda Airport in Tokyo, Japan, on Wednesday, April 1, 2015. A report showed the unemployment rate in Japan fell to 3.5 percent in February, matching economist estimates and declining from 3.6 percent the previous month. The jobs-to-applicants ratio increased to 1.15, the highest reading in 23 years. (Photo by Kiyoshi Ota/Bloomberg)

Japan Airlines (JAL) President Yoshiharu Ueki (front, C) and new employees of JAL Group toss carefully folded paper airplanes into the air during the entrance ceremony at a hangar with a Boeing 777 in Tokyo on April 1, 2015. (Photo by Kazuhiro Nogi/AFP Photo)

Martin Skrtel (L) of Slovakia catches Daniel Kolar of Czech Republic in the face during the friendly international football match between Slovakia and Czech Republic at Stadion Pod Dubnom in Zilina, Slovakia on March 31, 2015. (Photo by Radovan Stoklasa/AFP Photo)

Members of the CSC (Cibubur Soccer Club) Women Soccer Indonesia preparing for prayers prior to a football training session in Jakarta. Women playing football is not common in Indonesia despite it being one of the nation's favourite sports. (Photo by Adek Berry/AFP Photo)

Indonesian villagers work in their field as mount Sinabung spews volcanic materials seen from Tiga Kicat village in Karo, North Sumatra, Indonesia, April 2, 2015. Indonesia's Mount Sinabung volcano continued sending hot gas and rock down its slopes and into the sky. The 2,460-metre volcano had been dormant for 400 years before it erupted in August 2010. (Photo by Dedi Sahputra/EPA)

In this photograph taken on April 1, 2015, an Indonesian resident and child walk away from an abandoned school building as Mount Sinabung erupts in Karo district on the Indonesian island of Sumatra. According to authorities about 3,500 people were displaced after the February 2014 eruption of Mount Sinabung volcano and many are still living in evacuation centers as the volcano remains active. (Photo by Sutanta Aditya/AFP Photo)

A penitent casts his shadow as he takes part in “Nuestro Senor Atado a la Columna, Maria Santisima de la Paz y San Juan Evangelista” Holy Week procession in Arcos de la Frontera, Spain, Tuesday, March 31, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)