Rescue services personnel walk past a refuse truck that crashed into pedestrians in George Square, Glasgow, in Scotland December 22, 2014. Six people were killed when a rubbish lorry ran out of control and careered down a pavement crowded with Christmas shoppers in Glasgow, Scotland, on Monday, police said. (Photo by Reuters/Stringer)

A policeman stands near a refuse truck that crashed into pedestrians in George Square, Glasgow, in Scotland December 22, 2014. (Photo by Reuters/Stringer)

A woman gives flowers to a police officer near the scene where a refuse truck crashed into pedestrians in George Square, Glasgow, Scotland December 23, 2014. Six people were killed when a rubbish lorry ran out of control and careered down a pavement crowded with Christmas shoppers in Glasgow, Scotland, on Monday, police said. (Photo by Russell Cheyne/Reuters)

A couple of Russian Army helicopters fly over the Monument to Scuttled Ships, during a promotional campaign for contract service for Russian Army in Sevastopol, Crimea, Saturday, December 20, 2014. Russia on Saturday dismissed new U.S. sanctions as useless and said it was poised to wait as long as it takes for the U.S. to recognize its historic right to the Crimean peninsula. Following several rounds of sanctions earlier this year, President Barack Obama on Friday approved new restrictions on Crimea which Russia annexed in March after a hastily called referendum. (Photo by Max Vetrov/AP Photo)

A man walks past a dead body, whom according to rebel fighters, is a soldier loyal to Syria's President Bashar al-Assad, in Jobar, a suburb of Damascus December 22, 2014. Rebel fighters said the body was pulled from the frontline after an offensive by forces loyal to Syria's President Bashar al-Assad in an attempt to advance in the area but failed to do so. (Photo by Bassam Khabieh/Reuters)

An ultra-Orthodox Jewish boy from the Krois family lights candles for the Jewish holiday of Hanukkah at is house in Jerusalem's Mea Shearim neighbourhood December 22, 2014. (Photo by Ronen Zvulun/Reuters)

British pop music singer Joe Cocker performs on stage at San Sebastian's 40th Jazz Festival edition in Spain, in this July 25, 2005 file picture. The raspy-voiced, Grammy-winning singer Cocker, best known for his cover of the Beatles' “With A Little Help From My Friends” and “You Are So Beautiful”, has died, his agent said on December 22, 2014. He was 70. (Photo by Pablo Sanchez/Reuters)

Participants hold up sky lanterns to be released during the “Kapulica & Lanterns” event in Zagreb December 22, 2014. About 3000 participants attended the event, organized by contemporary artist Kresimir Tadija Kapulica as part of the ArtOmat Fair ahead of Christmas, which involved people releasing about a thousand lanterns to symbolize sending their wishes to the universe. (Photo by Antonio Bronic/Reuters)

Paper lanterns are released as a part of Christmas festivities in Zagreb, Croatia, Monday, December 22, 2014. (Photo by Darko Bandic/AP Photo)

Thiem Nguyen (L) and his sister-in-law Kim Chi Tran burn paper replica of cloth, money and incenses in front of a tomb, which they believe belongs to their relative, captain Pham Hoa Lu, on the 70th founding anniversary of the Vietnam People's Army, at the Viet-Laos cemetery in the border district of Anh Son December 22, 2014. Lu was killed by a U.S. bomb in Laos on December 19, 1971, according to the Vietnamese Defence Ministry. The Viet-Laos cemetery has interred remains of nearly 11,000 remains of Vietnamese soldiers, most of them unidentified, who were killed during Vietnam War, according to cemetery officials. (Photo by Reuters/Kham)

A tomb of an unknown soldier is pictured, on the 70th founding anniversary of the Vietnam People's Army, at the Viet-Laos cemetery in the border district of Anh Son December 22, 2014. The Viet-Laos cemetery has interred remains of nearly 11,000 remains of Vietnamese soldiers, most of them unidentified, who were killed during Vietnam War, according to cemetery officials. (Photo by Reuters/Kham)

A young woman stands near a mural of late revolutionary hero Ernesto “Che” Guevara in Havana December 22, 2014. From bus drivers to bartenders and ballet dancers, many Cubans are already imagining a more prosperous future after the United States said it will put an end to 50 years of conflict with the communist-run island. (Photo by Enrique De La Osa/Reuters)

Bicycle taxi drivers fix their vehicle in downtown Havana, December 22, 2014. (Photo by Alexandre Meneghini/Reuters)

A woman offers flowers for sale along a street in Havana December 23, 2014. (Photo by Enrique De La Osa/Reuters)

An employee poses for photographs with a Christmas tree decorated with gold accessories, as a promotional campaign of a gold store ahead of the Christmas, in Taiyuan, Shanxi province, China December 22, 2014. According to the store, about two kilograms (4.4 lbs) of gold accessories were used to decorate the tree. (Photo by Jon Woo/Reuters)

People visit newly-built ice sculptures illuminated by coloured lights during a trial operation of the 16th Harbin Ice and Snow World in Harbin, Heilongjiang province, December 22, 2014. The annual Harbin Ice and Snow World will be officially opened on January 5, 2015. (Photo by Reuters/Stringer)

A winter swimmer, wearing a Santa Claus hat to celebrate the upcoming Christmas, reacts as he plays on a frozen lake at a park in Shenyang, Liaoning province, December 22, 2014. The characters on the hat read: “Shenyang Winter Swimming”. (Photo by Reuters/Stringer)

A man wearing a Santa hat carries giant bags as he walks along a street at an old area of Liwan district in Guangzhou, Guangdong province December 23, 2014. (Photo by Alex Lee/Reuters)

A Buddhist devotee spins prayer wheels while offering daily prayers at the premises of Boudhanath Stupa in Kathmandu December 23, 2014. Listed as a world heritage site by UNESCO, the Boudhanath Stupa is considered one of the holiest places for Buddhists. (Photo by Navesh Chitrakar/Reuters)

Men sit in front of the prayer flags at the premises of Boudhanath Stupa in Kathmandu December 23, 2014. (Photo by Navesh Chitrakar/Reuters)

Injured children wait for treatment in a field hospital after what activists said was an air strike by forces loyal to Syria's President Bashar al-Assad in the Duma neighbourhood of Damascus December 23, 2014. (Photo by Mohmad Badra/Reuters)

A wounded child walks at a makeshift hospital in the besieged rebel-held town of Douma after being injured in a reported airstrike by government forces on December 23, 2014. Douma, a rebel bastion northeast of the capital, has been under government siege for more than a year, with residents facing dwindling food and medical supplies. (Photo by Abd Doumany/AFP Photo)

A man sells Santa Claus shaped balloons on a street in Hanoi December 23, 2014. (Photo by Reuters/Kham)

A man dressed as Father Christmas appears to levitate by using a specially-designed prop and costume as he waves to people in Trafalgar Square in central London December 22, 2014. (Photo by Eddie Keogh/Reuters)

French soldiers patrol near the Eiffel Tower in Paris as part of the “Vigipirate” security plan December 23, 2014. French security forces stepped up protection of public places on Tuesday after three acts of violence in three days left some 30 wounded and reignited fears about France's vulnerability to attacks by Islamic radicals. (Photo by Gonzalo Fuentes/Reuters)

A girl from the minority Yazidi sect sits near a box of food aid at Mount Sinjar December 22, 2014. On Sunday, Kurdish and Yazidi fighters battled to take the Sinjar back from Islamic State after breaking a months-long siege of the mountain above it. Seizing the town would restore the majority of territory Iraq's Kurds lost in Islamic State's surprise offensive in August. (Photo by Reuters/Stringer)

Men decorate a Christmas tree ahead of Christmas in a Christian slum in Islamabad December 23, 2014. (Photo by Faisal Mahmood/Reuters)

Female fighters of the Kurdish People's Protection Units (YPG) stand near the border between Syria and Iraq, close to the Iraqi town of Snoun December 22, 2014. On Sunday, Kurdish and Yazidi fighters battled to take the Sinjar back from Islamic State after breaking a months-long siege of the mountain above it. Seizing the town would restore the majority of territory Iraq's Kurds lost in Islamic State's surprise offensive in August Picture taken December 22, 2014. (Photo by Reuters/Stringer)

A Palestinian protester dressed in a Santa Claus costume argues with an Israeli border policeman during a demonstration against the Israeli settlements and demanding for free movement for the Palestinians during Christmas near a checkpoint in the West Bank city of Bethlehem December 23, 2014. (Photo by Mussa Qawasma/Reuters)

A Palestinian protester wearing a Santa Claus costume is carried by medics after inhaling tear gas fired by Israeli troops during clashes at Bethlehem checkpoint in the West Bank city of Bethlehem, Tuesday, December 23, 2014. (Photo by Majdi Mohammed/AP Photo)

A couple takes a picture in front of a light installation for Christmas celebrations in Beijing December 23, 2014. (Photo by Kim Kyung-Hoon/Reuters)

Visitors pose for a picture in front of a light installation for Christmas celebrations in Beijing December 23, 2014. (Photo by Kim Kyung-Hoon/Reuters)

A girl dressed in a Santa Claus costume poses for a souvenir picture in front of an light installation for Christmas celebrations in Beijing December 23, 2014. (Photo by Kim Kyung-Hoon/Reuters)