A staff member of China's Foreign Ministry takes a nap next to soldiers from the honour guards before a welcoming ceremony for Egypt's President Abdel Fattah al-Sisi at the Great Hall of the People in Beijing, December 23, 2014. (Photo by Jason Lee/Reuters)

A Palestinian man decorates a tree with spent tear gas canisters that he said were fired by Israeli troops during clashes with Palestinian protesters, at Manger Square, ahead of Christmas, in the West Bank city of Bethlehem December 23, 2014. (Photo by Ammar Awad/Reuters)

Palestinians decorate a tree with spent tear gas canisters that they said were fired by Israeli troops during clashes with Palestinian protesters, at Manger Square, ahead of Christmas, in the West Bank city of Bethlehem December 23, 2014. (Photo by Ammar Awad/Reuters)

The Kremlin's Spasskaya (Saviour) Tower, covered by scaffolding, is seen behind the mausoleum of Soviet state founder Vladimir Lenin at the Red Square in Moscow, December 23, 2014. The restoration works will last until the spring of 2015, according to local media. (Photo by Sergei Karpukhin/Reuters)

The Kremlin's Spasskaya (Saviour) Tower, covered by scaffolding, is seen behind the mausoleum of Soviet state founder Vladimir Lenin at the Red Square in Moscow, December 23, 2014. (Photo by Sergei Karpukhin/Reuters)

The Kremlin's Spasskaya (Saviour) Tower, covered by scaffolding, is seen behind the mausoleum of Soviet state founder Vladimir Lenin at the Red Square in Moscow, December 23, 2014. (Photo by Sergei Karpukhin/Reuters)

The two Mistral-class helicopter carriers “Sevastopol” (L) and “Vladivostok” are seen at the STX Les Chantiers de l'Atlantique shipyard site in Saint-Nazaire, western France, December 23, 2014. (Photo by Stephane Mahe/Reuters)

A surfer rides a wave during a night session in the Mediterranean Sea at Israel's southern city of Ashdod December 23, 2014. (Photo by Amir Cohen/Reuters)

Contestants in traditional Mongolian costumes attend a horse race on a grassland covered in snow during a winter Naadam event in Hulun Buir, north China's Inner Mongolia Autonomous Region, December 23, 2014. Tens of thousands of locals attended the event which consisted of horse and camel racing, folk performance, fire worship ritual and so on, local media reported. (Photo by Reuters/Stringer)

People pose for photographs in traditional Mongolian costumes on a grassland covered in snow during a winter Naadam event in Hulun Buir, north China's Inner Mongolia Autonomous Region, December 23, 2014. (Photo by Reuters/Stringer)

Hundreds of stolen women's underwear are placed on the ground after being found hidden in the ceiling of a apartment building, in Yulin, Guangxi Zhuang Autonomous Region, December 19, 2014. A Chinese man who stole hundreds of pieces of ladies' underwear had his secret exposed after an emergency exit ceiling where he had been storing his hoard collapsed, state media reported. The man, surnamed Tang and in his 30s, admitted to having mental problems since he was young and that he did not know how long he had been obsessed with women's undergarments, reports said. Police in the city of Yulin said they found more than 2,000 pieces of panties and bras in the roof where he had stuffed his collection. (Photo by Reuters/Stringer)

Students hold hands to form a human chain during a demonstration demanding for the right for Nepali mothers to pass on citizenship to their children, as a new constitution is drafted in Kathmandu December 24, 2014. The new assembly was elected to write a constitution after the abolition of the 240-year-old feudal monarchy that the Maoists fought against. (Photo by Navesh Chitrakar/Reuters)

A girl with a placard takes part during a demonstration demanding for the right for Nepali mothers to pass on citizenship to their children, as a new constitution is drafted in Kathmandu December 24, 14. (Photo by Navesh Chitrakar/Reuters)

Window cleaners dressed as Santa Claus and a reindeer pose for pictures during an event to celebrate Christmas at a shopping mall in Tokyo December 24, 2014. (Photo by Yuya Shino/Reuters)

Indonesian police guard prisoners who were evacuated from a local prison due to flooding in Lhoksukon, Aceh province December 23, 2014 in this photo taken by Antara Foto. A total of 200 prisoners were forced to evacuate after flood waters from heavy rains reached 2 meters high. (Photo by Reuters/Antara Foto/Rahmad)

A boy poses for a photo with Christmas decorations in front of a shopping mall in Beijing, December 24, 2014. (Photo by Jason Lee/Reuters)

An exterior view of the Confluences Musee is seen on the southern tip of the peninsula where the Rhone and Saone rivers join in Lyon, France December 23, 2014. The museum, which opened December 20, includes collections of natural science, anthropology and Earth Sciences from the Guimet Natural History Museum. Austrian architects Coop Himmelb(l)au designed the museum. (Photo by Robert Pratta/Reuters)

A tribal plantation worker holds a bow and arrow as he stands next to a burning house belonging to indigenous Bodo tribesmen after ethnic clashes in Balijuri village, in Sonitpur district in the northeastern Indian state of Assam, India December 24, 2014. Militants fighting for a separate homeland for indigenous Bodo tribesmen went on a killing spree in Assam state on Tuesday, killing 51 people in four attacks in the space of an hour, the deadliest violence in months. The victims of the guerrilla attacks were mostly tea-plantation workers from other parts of India. Assam has a history of sectarian bloodshed and armed groups fighting for autonomy or secession. (Photo by Reuters/Stringer)

Tribal men with their bows and arrows watch towards houses belonging to Bodo community people after they were set on fire in retaliation in Tenganala village in Sonitpur district of Assam state, India, 24 December 2014. Police said on 24 December the number of villagers killed by insurgents in north-east India has risen to more than 60. Police said that the attackers were likely militants from the National Democratic Front of Bodoland, which opposes peace talks between the government and some Bodo groups. Some members of the Bodo ethnic group from the state of Assam are fighting for autonomy or their own state. (Photo by EPA/Stringer)

Luky Moni Orang, 22, an Indian tribal settler, holds her three-day old baby as she takes refuge in a local church after her village was attacked by an indigenous separatist group, in Shamukjuli village in Sonitpur district of Indian eastern state of Assam, Thursday, December 25, 2014. (Photo by Anupam Nath/AP Photo)

Indian tribal children react to camera at a relief camp at Tinsuti village in Sonitpur district of Indian eastern state of Assam, India, Thursday, December 25, 2014. Police says the death toll from rebel violence in remote northeastern India has risen to over 70 with the recovery of more bodies from abandoned villages. Authorities have said rebels belonging to a faction of an indigenous separatist group called the National Democratic Front of Bodoland attacked tribal settlers known as Adivasi late Tuesday. Most of the Adivasis, whose ancestors migrated to Assam more than 100 years ago, work on tea plantations. (Photo by Anupam Nath/AP Photo)

A staff wearing a Super Mario Brother costume made of balloons is led by his colleague as they walk among customers during a promotional event to celebrate Christmas, at a department store in Beijing, December 24, 2014. (Photo by Barry Huang/Reuters)

A woman carrying a bag on her head waits to buy clothes at a streetside stall at the central business district, a day before Christmas, in Lagos December 24, 2014. (Photo by Akintunde Akinleye/Reuters)

Beads and necklaces are displayed for sale at a street side stall at the central business district, a day before Christmas, in Lagos December 24, 2014. (Photo by Akintunde Akinleye/Reuters)

A volunteer makes her way through bags with toys during the annual gift-giving event organised by firefighters in Ciudad Juarez December 24, 2014. The firefighters from Ciudad Juarez collect donated toys throughout the year for Christmas and hand them out to poor children on Christmas eve. (Photo by Jose Luis Gonzalez/Reuters)

Members of a local powered parachute club wearing Santa Claus costumes fly past residential buildings to drop presents to pedestrians during a promotional event celebrating Christmas in Guiyang, Guizhou province December 24, 2014. (Photo by Reuters/Stringer)

Owners of Harley-Davidson motorcycles wearing Santa Claus costumes ride along a street to give presents to elders at a nursing home during a promotional event celebrating Christmas in Guangzhou, Guangdong province December 24, 2014. (Photo by Reuters/Stringer)

People's Liberation Army (PLA) soldiers pour snow from a tyre onto their head during a training session in Heihe, Heilongjiang province December 24, 2014. (Photo by Reuters/Stringer)

A contestant wearing a Santa Claus costume rides in a sledge pulled by a reindeer during a race on snow-covered tracks at the opening ceremony of a local winter festival in Genhe of Hulun Buir, north China's Inner Mongolia Autonomous Region, December 24, 2014. Christmas is not a traditional festival in officially atheist China but is growing in popularity, especially in more metropolitan areas where young people go out to celebrate, give gifts and decorate their homes. (Photo by Reuters/Stringer)

A girl with henna-dyed hands, attend a mass on Christmas day at the St John's Cathedral Church, in Peshawar December 25, 2014. (Photo by Fayaz Aziz/Reuters)

A girl checks a cross pendent at a stall in the premises of the St John's Cathedral Church, on Christmas day in Peshawar December 25, 2014. (Photo by Fayaz Aziz/Reuters)

A boy wearing a raincoat and a helmet stands under the rain on a road in Pasar Atjeh in Banda Aceh December 25, 2014. (Photo by Reuters/Beawiharta)