A Pakistani devotee dances at a shrine of Madhu Lal Shah Hussain, a poet also regarded as a Sufi saint, during an annual festival to celebrate him in Lahore, Pakistan, Saturday, March 28, 2015. The annual festival to commemorate Shah Hussain (1538-1599) commonly known as Madhu Lal Hussain started on Saturday with thousands of people expected to visit the shrine. (Photo by K. M Chaudary/AP Photo)

An Owl Wing Butterfly rests on the face of a young girl at a butterfly exhibition at the Natural History Museum in London, Britain, 31 March 2015. Hundreds of tropical butterflies are on show at the exhibit that runs from 02 April to 13 September. (Photo by Andy Rain/EPA)

Ava Kennedy, 6, poses as she looks closely at two owl butterflies as they land on her hands during a media opportunity at the Natural History Museum in London, Tuesday, March 31, 2015. Hundreds of live tropical butterflies will fill the butterfly house for the returning exhibition called “Sensational Butterflies” open at the museum from April 2 until September 13. (Photo by Kirsty Wigglesworth/AP Photo)

This photo provided by the Transportation Safety Board of Canada shows a Air Canada Airbus A-320 at Halifax International Airport after making an “abrupt” landing and skidding off the runway in bad weather early Sunday, March 29, 2015. Officials said 23 people were taken to a hospital for observation and treatment of minor injuries, none of which were considered life threatening. (Photo by AP Photo/The Transportation Safety Board of Canada)

Heather Mack, from Chicago, Ill., right, stands inside a cell as her relative holds her baby before her trial at Denpasar's district court in Bali, Indonesia, Tuesday, March 31, 2015. Tommy Schaefer, 21, and Mack, 19, are being tried separately by Denpasar District Court on a charge of premeditated murder for the death of Sheila von Wiese-Mack at a hotel last August. (Photo by Firdia Lisnawati/AP Photo)

Several thousand people carry patriotic flags as they demonstrate against the proposed production of Wagner's Tannhauser, in downtown Novosibirsk, about 2800 kilometers (1,750 miles) east of Moscow, Sunday, March 29 2015. Controversy over the staging of Wagner's opera “Tannhauser” in the Siberian city has come to a head, with Russia's cultural minister firing the director of the state theater in Novosibirsk. The announcement was made Sunday as several thousand people rallied outside the theater to protest the production, which they said was offensive to Orthodox Christians. (Photo by Ilnar Salakhiev/AP Photo)

A war veteran and relatives sing the national anthem during a ceremony remembering the Argentine soldiers killed during the Falklands war in Buenos Aires, Argentina, Thursday, April 2, 2015. April 2 marks the 33rd anniversary of the beginning of the war between Argentina and Great Britain over the possession of the Falklands Islands. (Photo by Natacha Pisarenko/AP Photo)

Supporters of President Elect, Gen. Muhammadu Buhari, celebrate his victory in Abuja, Nigeria, Wednesday, April 1, 2015. Nigerian President Goodluck Jonathan conceded defeat to Buhari, a 72-year-old former military dictator, who was elected in a historic transfer of power following the nation's most hotly contested election ever. (Photo by Sunday Alamba/AP Photo)

Sebastien Bourdais, of France, smiles as he walks to his car before practice for the IndyCar Firestone Grand Prix of St. Petersburg auto race Saturday, March 28, 2015, in St. Petersburg, Fla. The race takes place on Sunday. (Photo by Chris O'Meara/AP Photo)

Kashmiri women carry pots filled with drinking water on their heads and walk past security officers standing guard during a gunbattle at Hardshoora village, 35 kilometers (20 miles) north of Srinagar, India, Thursday, April 2, 2015. Suspected Kashmiri rebels and Indian security personnel were engaged in a fierce gunbattle Thursday in the Himalayan territory, officials said. (Photo by Mukhtar Khan/AP Photo)

Anna Cappellini and Luca Lanotte of Italy perform during the Exhibition event in the ISU World Figure Skating Championship 2015 held at the Oriental Sports Center in Shanghai, China, Sunday, March 29, 2015. (Photo by Ng Han Guan/AP Photo)

Elizaveta Tuktamysheva of Russia performs during the Exhibition event in the ISU World Figure Skating Championship 2015 held at the Oriental Sports Center in Shanghai, China, Sunday, March 29, 2015. (Photo by Ng Han Guan/AP Photo)

A penitent of the “Virgen de la Esperanza” brotherhood looks as he waits for the beginning of a Holy Week procession in Zamora, Spain, Thursday, April 2, 2015. Hundreds of processions take place throughout Spain during the Easter Holy Week. (Photo by Andres Kudacki/AP Photo)

An officer walks out of the LaMott Fire Company after police escorted a man away, Tuesday, March 31, 2015, in Elkins Park, Pa. Authorities say a former volunteer firefighter held four firefighters hostage at the Philadelphia-area firehouse before surrendering to police. No injuries were reported. (Photo by Matt Rourke/AP Photo)

A man washes the face of a female voter that was beaten by a Nigerian policewoman at a poling station during an altercation. The police woman was later arrested for misconduct, in Lagos, Nigeria, Saturday, March 28, 2015. Millions of Nigerians turned out Saturday to vote in a presidential election that analysts say is too close to call between President Goodluck Jonathan and former military dictator Muhammadu Buhari. (Kunle Ogunfuyi/AP Photo)

An Ultra-Orthodox Jew throws leavened items onto a fire in Jerusalem during the final preparations before the start of the Jewish Passover holiday, which begins at sunset, on April 3, 2015. (Photo by Gil Cohen Magen/AFP Photo)

The 2016 Chevrolet Spark is presented at the New York International Auto Show, Thursday, April 2, 2015. (Photo by Mark Lennihan/AP Photo)

The coffin of Merit, architect Kha's wife, is seen at the Egyptian Museum of Turin, Italy, Tuesday, March 31, 2015. The museum, containing the world's second-largest collection of Egyptian artifacts after Cairo, is unveiling its new digs, including state-of-the art displays and an exhibit space double the original, allowing ancient artifacts to come out of storage and be seen by the public for the first time. (Photo by Antonio Calanni/AP Photo)

Hundreds of Nigerians celebrate at an intersection in the flashpoint northern city of Kaduna on March 31, 2015 the victory of main opposition All Progressives Congress (APC) presidential candidate Mohammadu Buhari. (Photo by Nichole Sobecki/AFP Photo)

Children dance on the streets of Tundu Wada to celebrate the win of presidential candidate Muhammadu Buhari of the All Progressives Congress Party in Kaduna, Nigeria on Tuesday, March 31, 2015. (Photo by Jane Hahn/The Washington Post)

Summer Reign, and from left, Millie Thrasher, and Celine Polenghi of the musical group Sweet Suspense attend Just Jared's Throwback Thursday Party Presented by Monster High at Moonlight Rollerway on Thursday, March 26, 2015, in Glendale, Calif. (Photo by Colin Young-Wolff/Invision for Just Jared!/AP Images)

Penitents take part in “Santisimo Cristo del Perdon, Maria Santisima de la Piedad y San Juan Evangelista” Holy Week procession while girls take snapshots in Arcos de La Frontera, Spain, Wednesday, April 1, 2015. Hundreds of processions take place throughout Spain during the Easter Holy Week. (Photo by Daniel Ochoa de Olza/AP Photo)

Girls watch as penitents dressed as Roman empire's soldiers walk around the village during the “Nuestro Padre Jesus Preso” Holy Week procession in Puente Genil, Spain, Thursday, April 2, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

Penitents take part in “Santisimo Cristo del Perdon, Maria Santisima de la Piedad y San Juan Evangelista” Holy Week procession in Arcos de La Frontera, Spain, Wednesday, April 1, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

CiCi Bellis returns the ball to Serena Williams during their match at the Miami Open tennis tournament in Key Biscayne, Fla., Sunday, March 29, 2015. Williams 6-1, 6-1. (Photo by J. Pat Carter/AP Photo)

A Pakistani Christian woman kisses a representation of the Christ during a Mass on Good Friday in a church in Lahore, Pakistan, Friday, April 3, 2015. Christians around the world are marking the Easter holy week. (Photo by K. M. Chaudary/AP Photo)

A woman jumps into an icy water tank during the Tough Mudder 10-12 mile obstacle challenge in San Bernardino, California March 28, 2015. (Photo by Lucy Nicholson/Reuters)

Madonna, left, and Taylor Swift perform at the iHeartRadio Music Awards at The Shrine Auditorium on Sunday, March 29, 2015, in Los Angeles. (Photo by John Shearer/Invision for iHeartRadio/AP Images)

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)

UFC fighter Ronda Rousey makes a surprise appearance at WrestleMania 31 on Sunday, March 29, 2015 at Levi's Stadium in Santa Clara, CA. WrestleMania broke the Levi's Stadium attendance record at 76,976 fans from all 50 states and 40 countries. (Photo by Don Feria/AP Images for WWE)

A woman walks by an Opel Corsa automobile, on display at the Bucharest Auto Moto Show in Bucharest, Romania, Thursday, April 2, 2015. The show displays mostly brands on sale in the Romanian market.(Photo by Vadim Ghirda/AP Photo)

Actress Christina Hendricks, right, unveils the new Jaguar all-aluminum XF sedan at Flat Iron Square ahead of its debut at the New York International Auto Show, Tuesday, March 31, 2015, in New York. (Photo by Mary Altaffer/AP Photo)

A Japanese fan with a horse mask points the direction of the track as he and another Japanese fan with a mask visit the Dubai World Cup horse racing at the Meydan Racecourse in Dubai, United Arab Emirates, Saturday, March 28, 2015. (Photo by Kamran Jebreili/AP Photo)

A view of Slovakia pavilion under construction at the Expo site in Rho, in the outskirts of Milan, Italy, Thursday, April 2, 2015. The theme of the Expo 2015 in Milan is “Feeding the Planet, Energy for Life”. (Photo by Antonio Calanni/AP Photo)

A Connecticut fan holds a puppet during the second half of a regional final game against Dayton in the NCAA women's college basketball tournament on Monday, March 30, 2015, in Albany, N.Y. (Photo by Tim Roske/AP Photo)

A penitent wears his village's traditional Judea mask and colorful hats during the Calvario procession by the “Nuestro Padre Jesus Nazareno and Nuestra Seóora de la Piedad” brotherhood in Iznajar, Spain, Friday, April 3, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

Penitents wear their village's traditional Judea mask and colorful hats during the Calvario procession by the “Nuestro Padre Jesus Nazareno and Nuestra Seóora de la Piedad” brotherhood in Iznajar, Spain, Friday, April 3, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

A motocross pilot performs a stunt jump in front of the city's skyline during a promotional event for an energy drink in Hong Kong on April 3, 2015. The famous city's skyline is often used as part of the promotional events by various brands and organisations. (Photo by Philippe Lopez/AFP Photo)