An elderly Afghan refugee man performs his wado, or cleaning himself before praying, outside his mud house in a slum on the outskirts of Islamabad, Pakistan, Wednesday, January 21, 2015. (Photo by Muhammed Muheisen/AP Photo)

A Pakistani woman shows her daughter bubbles released by a vendor in Lake View park in Islamabad, Pakistan, Saturday, January 24, 2015. (Photo by Shakil Adil/AP Photo)

A Pakistani police officer, left, stands guard while a polio worker vaccinates an Afghan refugee child against polio in a slum on the outskirts of Islamabad, Pakistan, Wednesday, January 21, 2015. Militants have spread a rumor among ultraconservative parents in Pakistan's deeply religious northwest, saying the polio vaccine will make their children impotent. The vaccine, they claim, is a ploy by the West to limit the world's Muslim population. (Photo by Muhammed Muheisen/AP Photo)

A horse transports bricks from a site to another at a Pakistani brick factory on the outskirts of Islamabad, Pakistan, Saturday, January 24, 2015. (Photo by Muhammed Muheisen/AP Photo)

An Afghan refugee girl holds her younger sister in a slum on the outskirts of Islamabad, Pakistan, Sunday, January 18, 2015. (Photo by Muhammed Muheisen/AP Photo)

A trained monkey sits on a can next to his owner as they wait for customers to perform to in a park in Islamabad, Pakistan, Saturday, January 24, 2015. (Photo by Muhammed Muheisen/AP Photo)

A Pakistani woman washes her laundry outside her makeshift tent in a slum in Rawalpindi, Pakistan, Friday, January 23, 2015. (Photo by Muhammed Muheisen/AP Photo)

A Christian woman arranges laundry on the roof top of her house in a Christian colony in Islamabad January 20, 2015. (Photo by Sara Farid/Reuters)

A young boy carries his rocking horse toy on his shoulder next to another boy in an ally inside a Christian colony in Islamabad January 20, 2015. (Photo by Sara Farid/Reuters)

A boy plays on swing while visiting Hanna Lake after a snowfall on the outskirts of Quetta January 21, 2015. (Photo by Naseer Ahmed/Reuters)

A man eats his lunch of boiled rice while selling bags along a road in Karachi January 21, 2015. (Photo by Akhtar Soomro/Reuters)

A man and his daughters walk along the snow-covered Hanna Lake after a snowfall on the outskirts of Quetta January 21, 2015. (Photo by Naseer Ahmed/Reuters)

A man carries a fruit crate while crossing a bridge in a slum on the outskirts of Islamabad January 21, 2015. (Photo by Faisal Mahmood/Reuters)

Men eat oranges from a push cart along a road as a vehicle travels past them in Karachi January 22, 2015. (Photo by Akhtar Soomro/Reuters)

A girl stands beside the gate of her family home with cow dung cakes on wall, on the outskirts of Peshawar January 22, 2015. (Photo by Fayaz Aziz/Reuters)

A nomad girl runs while grazing her family's goats and seeps on the outskirts of Peshawar January 22, 2015. (Photo by Fayaz Aziz/Reuters)

A girl reacts to camera as she bends to recover her pair of shoe from mud after the rain on outskirts of Peshawar January 22, 2015. (Photo by Fayaz Aziz/Reuters)

Abdul Karim, 75, covers himself from the cold while sitting on a rope bed near a shop on the outskirts of Peshawar January 22, 2015. (Photo by Fayaz Aziz/Reuters)

A girl walks on a muddy alley on her way home in a slum area on the outskirts of Islamabad January 21, 2015. (Photo by Faisal Mahmood/Reuters)

A girl with a bowl runs over a bridge after a rain on the outskirts of Peshawar January 22, 2015. (Photo by Fayaz Aziz/Reuters)

Women carry water as they walk on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl stands at her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl cooks over a wood-burning fire at her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl cooks over a wood-burning fire at her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl tries to fix the cracked ground outside her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A family sits around a wood fire while waiting for tea to brew at their house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A boy is seen at his family home on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A man holds a cup of tea while he sits with his family at their house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A woman adjusts her prayer beads while her daughter-in-law cooks at her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

Children study by the light coming in through the entrance of the room during a power shortage at their house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl holds a goat outside her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

A girl pulls a goat outside her house on Margalla Hills in Islamabad January 22, 2015. (Photo by Zohra Bensemra/Reuters)

An Afghan refugee girl runs on a wooden bridge over a stream of rain water and sewage in a slum on the outskirts of Islamabad, Pakistan, Saturday, January 17, 2015. (Photo by Muhammed Muheisen/AP Photo)

A Pakistani man having a haircut at a street barber shop is reflected on the mirror of another barber in Islamabad, Pakistan, Saturday, January 24, 2015. (Photo by Muhammed Muheisen/AP Photo)

Afghan refugee girls play in a slum on the outskirts of Islamabad, Pakistan, Saturday, January 17, 2015. (Photo by Muhammed Muheisen/AP Photo)

An Afghan refugee boy holds a tire while standing next to his sheep feeding in a field on the outskirts of Islamabad, Pakistan, Saturday, January 24, 2015. (Photo by Muhammed Muheisen/AP Photo)

Pakistani children play around a woman, center, cleaning the hair of her children on a bed outside her makeshift home in a slum on the outskirts of Islamabad, Pakistan, Friday, January 23, 2015. (Photo by Muhammed Muheisen/AP Photo)

A Pakistani girl carrying buckets walks back to her family's makeshift tent in a slum in Rawalpindi, Pakistan, Friday, January 23, 2015. (Photo by Muhammed Muheisen/AP Photo)

Pakistani boys plays snooker for 10 Rupees (U.S. 10 cents) per game, in a slum in Rawalpindi, Pakistan, Friday, January 23, 2015. (Photo by Muhammed Muheisen/AP Photo)

Pakistani children travel to school in a van in Peshawar on January 12, 2015. Schools in Pakistan's northwestern city of Peshawar re-opened on January 12 for the first time since a Taliban raid massacred 150 people, mainly children, with returning students expressing defiance tinged with apprehension. (Photo by A. Majeed/AFP Photo)