A man waits in line for one of 5,000 holiday food bags provided at Glide Memorial Church in the Tenderloin neighborhood in San Francisco, California December 17, 2014. Glide's foundation serves a cross-section of homeless and low-income people, and provides a variety of services including free meals.

Robert Galbraith/Reuters

A man waits in line for one of 5,000 food bags provided at Glide Memorial Church in the Tenderloin neighborhood in San Francisco, California on Wednesday

Christian worshipper is seen inside the Grotto, where Christians believe Virgin Mary gave birth to Jesus, at the Church of Nativity ahead of Christmas in the West Bank town of Bethlehem...A Christian worshipper is seen inside the Grotto, where Christians believe Virgin Mary gave birth to Jesus, at the Church of Nativity ahead of Christmas in the West Bank town of Bethlehem December 17, 2014.

Ammar Awad/Reuters

A Christian worshipper is seen inside the Grotto, where Christians believe Virgin Mary gave birth to Jesus, at the Church of Nativity ahead of Christmas in the West Bank town of Bethlehem on Wednesday

Supporters of Tunisian presidential candidate and former prime minister Beji Caid Essebsi , 88, wave their national flag and his portrait as he gives a speech at a meeting during his presidential election campaign tour on December 17, 2014 in the Kef region, northwest of the capital Tunis, as Tunisians prepare to vote on the weekend in the second round of  the presidential election, capping off four years of a sometimes chaotic transition since their country sparked the Arab Spring. Essebsi's secular Nidaa Tounes party won parliamentary elections in October and he has emerged as the clear favourite to be Tunisia's next leader, though with reduced influence after constitutional changes stripped the president of many powers.

Fethi Belaid/AFP

Supporters of Tunisian presidential candidate and former prime minister Beji Caid Essebsi , 88, wave their national flag and his portrait as he gives a speech during his campaign tour in the Kef region, northwest of Tunis. The second round of the presidential vote takes place at the weekend, capping off four years of a sometimes chaotic transition since the country sparked the Arab spring

Rescue workers gather around a collapsed building in Makongeni area of Nairobi, Kenya. Several people are feared trapped or dead after a five-storey residential building collapsed in the early hours of Wednesday. The cause of the collapse in unknown

Dai Kurokawa/EPA

Rescue workers gather around a collapsed building in Makongeni area of Nairobi, Kenya. Several people were feared trapped or dead after a five-storey residential building collapsed early on Wednesday

Couples dance a tango in front of Saint Peter's basilica at the Vatican, December 17, 2014. At the rear edge of the square more than 2,000 people, who came to Rome from all over Italy for the 78th birthday of Pope Francis, danced in "A tango for Pope Francis" event as music blared.

Tony Gentile/Reuters

Couples dance a tango in front of Saint Peter’s basilica at the Vatican on Wednesday. At the rear edge of the square more than 2,000 people, in Rome to celebrate the 78th birthday of Pope Francis, danced in “A tango for Pope Francis” event as music blared

Soldiers shout as they practise in temperatures of about minus 30 degrees centigrade (-22 F) in Heihe, Heilongjiang province

China Daily/Reuters

Soldiers practise manoeuvres in temperatures of minus 30C in Heihe, Heilongjiang province in northeast China

Indian school children observe two-minutes of silence to pray for the victims who were killed in an attack at the Army run school in Peshawar, Pakistan, during their prayer meeting, in New Delhi, India, 17 December 2014. Nearly 140 people, the vast majority children, were killed at a military-run school in north-western Pakistan Tuesday in an attack by Islamist militants. At least 139 people including more than 125 children died before army commandos killed all six attackers and regained control of the building. Indian Prime Minister Narendra Modi condemned the terror attack and called two minutes silence in school's across the nation

Money Sharma/EPA

Schoolchildren in New Delhi, India, observe a two-minute silence on Wednesday to pray for the victims killed in the attack at an army run school in Peshawar, Pakistan

Austria's Eva-Maria Brem during the second run of the women's World Cup giant slalom in Are, Sweden,  Friday, Dec. 12, 2014. Brem  came third

Marcus Ericsson/TT News/AP

Austria’s Eva-Maria Brem during the second run of the women’s World Cup giant slalom in Are, Sweden on Friday. Brem ended up in third place

A pro-Russian-separatist patrols the street in front of Russian humanitarian trucks in Makiivka (Makeyevka) in Donetsk region, December 12, 2014. According to Russian media, over 50 trucks arrived in Donetsk while another 80 trucks arrived in Luhansk

Maxim Shemetov/Reuters

A pro-Russian-separatist patrols the street in front of Russian humanitarian trucks in Makiivka (Makeyevka) in Donetsk region on Friday

Part of the crowd holding Kenyan flags cheer as Kenyan President arrives at the Nyayo National Stadium Nairobi, Kenya Friday, Dec. 12, 2014, during the 51st Madaraka Day or Independence from British Rule celebrations.

Sayyid Azim/AP

Part of the crowd holding Kenyan flags cheer as Kenyan President arrives at the Nyayo National Stadium Nairobi, Kenya on Friday, during the 51st Madaraka Day or Independence from British Rule celebrations