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In this Friday, Jan. 24, 2014 photo, Afghan refugee girl, laiba Hazrat, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( APTOPIX Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee boy, Akhtar Babrek, 13, poses for a picture, in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee girl, Robina Haseeb, 5, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( APTOPIX Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee boy, Hayat Khan, 8, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone.Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee girl, Naseebah Zarghoul, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee boy, Awal Gul, 12, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014 photo, Afghan refugee youth, Shahzada Saleem, 15, holds his nephew Satara, two months, as they pose for a picture, in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee girl, Gul Bibi Shamra, 3, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( APTOPIX Pakistan Refugees Photo Essay )

In this Sunday, Jan. 26, 2014 photo, Afghan refugee boy, Hazrat Babir , 7, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Monday, Jan. 27, 2014 photo, Afghan refugee girl, Khalzarin Zirgul, 6, holds her cousin, Zaman, 3 months, as they pose for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan, Monday, Jan. 27, 2014. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Sunday, Jan. 26, 2014 photo, Afghan refugee boy, Ibraheem Rahees, 8, poses for a picture, in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( APTOPIX Pakistan Refugees Photo Essay )

In this Monday, Jan. 27, 2014 photo, Afghan refugee girl, Madina Juma'a, 4, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014 photo, Afghan refugee boy, Abdulrahman Bahadir, 13, poses for a picture, in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the worldís largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.ís refugee agency. (AP Photo/Muhammed Muheisen) ( APTOPIX Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014 photo, Afghan refugee girl, Zarlakhta Nawab, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014 photo, Afghan refugee girl, Nazmina Bibi, 7, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Monday, Jan. 27, 2014 photo, Afghan refugee boy, Allam Ahmad, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Friday, Jan. 24, 2014 photo, Afghan refugee girl, Safia Mourad, 4, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014, photo, Afghan refugee girl, Gullakhta Nawab, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014, photo, Afghan refugee girl, Basmina, 3, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Saturday, Jan. 25, 2014 photo, Afghan refugee boy, Waheed Wazir, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )

In this Sunday, Jan. 26, 2014 photo, Afghan refugee boy, Noorkhan Zahir, 6, poses for a picture, while playing with other children in a slum on the outskirts of Islamabad, Pakistan. For more than three decades, Pakistan has been home to one of the world’s largest refugee communities: hundreds of thousands of Afghans who have fled the repeated wars and fighting their country has undergone. Since the 2002 U.S.-led invasion of Afghanistan, some 3.8 million Afghans have returned to their home country, according to the U.N.’s refugee agency. (AP Photo/Muhammed Muheisen) ( Pakistan Refugees Photo Essay )