PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather at the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: An Afghan woman waits near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan families walk near the UNHCR office as they wait for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugee kids wait near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: An Afghan refugee kid is taken a vaccine by mouth as he waits near the UNHCR office with his family for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees wait in a queue near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees wait in a queue near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )

PESHAWAR, PAKISTAN, APRIL 03: Afghan refugees gather near the UNHCR office for their registration process to cross the Torkham Border Crossing for returning back to Afghanistan after reopening of the Pakistan-Afghanistan border, in Peshawar, Pakistan on April 03, 2017. ( Saeed Ahmad - Anadolu Agency )