Paramilitary forces leave the Police Training Center after an attack on the center in Quetta, Pakistan October 25, 2016. REUTERS/Naseer Ahmed 

A Palestinian girl aims a pistol as she prepares to fire at a target during a training session for the families of Hamas officials, organized by Hamas-run Security and Protection Service, in Khan Younis in the southern Gaza Strip July 24, 2016. REUTERS/Ibraheem Abu Mustafa 

A Palestinian woman aims a pistol as she prepares to fire at a target during a training session for the families of Hamas officials, organized by Hamas-run Security and Protection Service, in Khan Younis in the southern Gaza Strip July 24, 2016. REUTERS/Ibraheem Abu Mustafa 

A Palestinian girl aims a pistol as she prepares to fire at a target during a training session for the families of Hamas officials, organized by Hamas-run Security and Protection Service, in Khan Younis in the southern Gaza Strip July 24, 2016. REUTERS/Ibraheem Abu Mustafa TPX IMAGES OF THE DAY

In this file image taken from a video recording, Omar Khalid Khorasani (C), a top Pakistan Taliban commander, gives an interview in Pakistan's Mohmand tribal region on June 2, 2011. General Asim Bajwa, director general of the Pakistani army's media division, reported the death of Umar Narai, also known as Khalifa Umar Mansoor or Khalid Khurasani, in a message on Twitter on July 13, 2016. REUTERS/Handout/File Photo 

In this file image taken from a video recording, Omar Khalid Khorasani (C), a top Pakistan Taliban commander, gives an interview in Pakistan's Mohmand tribal region on June 2, 2011. General Asim Bajwa, director general of the Pakistani army's media division, reported the death of Umar Narai, also known as Khalifa Umar Mansoor or Khalid Khurasani, in a message on Twitter on July 13, 2016. REUTERS/Handout/File Photo TPX IMAGES OF THE DAY

In this file image taken from a video recording, Omar Khalid Khorasani (C), a top Pakistan Taliban commander, gives an interview in Pakistan's Mohmand tribal region on June 2, 2011. General Asim Bajwa, director general of the Pakistani army's media division, reported the death of Umar Narai, also known as Khalifa Umar Mansoor or Khalid Khurasani, in a message on Twitter on July 13, 2016. REUTERS/Handout/File Photo 

Lebanon's Hezbollah members carry the coffin of their comrade, Omar al-Obeid, who was killed fighting alongside Syrian army forces in Syria, during his funeral in Doueir village, near Nabatieh in southern Lebanon, July 5, 2016. REUTERS/Ali Hashisho 

Lebanon's Hezbollah members carry Hezbollah flags during the funeral of their comrade, Omar al-Obeid, who was killed fighting alongside Syrian army forces in Syria, in Doueir village, near Nabatieh in southern Lebanon, July 5, 2016. REUTERS/Ali Hashisho 

Lebanon's Hezbollah members stand at attention near the coffin of their comrade, Omar al-Obeid, who was killed fighting alongside Syrian army forces in Syria, during his funeral in Doueir village, near Nabatieh in southern Lebanon, July 5, 2016. REUTERS/Ali Hashisho 

Iraqi security forces ride in vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

A member of Iraqi security forces gestures from a vehicle as he travels to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces wait for vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad TPX IMAGES OF THE DAY

Iraqi security forces climb into trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces climb into trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces climb into trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces ride in trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces climb into trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces climb into trucks travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Iraqi security forces run to vehicles travelling to Mosul to fight against militants of Islamic State at an Iraqi army base in Camp Taji in Baghdad, February 21, 2016. REUTERS/Ahmed Saad 

Three men that Democratic Forces of Syria fighters claimed were Islamic State fighters sit on a pick-up truck while being held as prisoners, near al-Shadadi town, Hasaka countryside, Syria, February 18, 2016. REUTERS/Rodi Said 

One of the three men that Democratic Forces of Syria fighters claimed were Islamic State fighters gestures while being held as a prisoner with fellow fighters near al-Shadadi town, Hasaka countryside, Syria, February 18, 2016. REUTERS/Rodi Said TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

Women mourn the death of a relative killed by Islamic State fighter in Mteahh village near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

A woman mourns the death of her son killed by Islamic State fighters in Mteahh village near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Women mourn the death of a relative killed by Islamic State fighter in Mteahh village near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Smoke rises from an Islamic State vehicle near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Women mourn the death of a relative killed by Islamic State fighters while carrying his picture in Mteahh village near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Democratic Forces of Syria women fighters gesture while riding a pick-up truck near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Democratic Forces of Syria fighters ride a pick-up truck with Islamic State fighters held as prisoners near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

Democratic Forces of Syria fighters ride a pick-up truck near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Democratic Forces of Syria fighters ride a pick-up truck near al-Shadadi town, Hasaka countryside Syria February 18, 2016. REUTERS/Rodi Said

A Belgian fighter from the Democratic Forces of Syria holds a cigarette in his mouth inside a military vehicle in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria stand on a lookout point to watch for Islamic State fighters in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria walk with their weapons in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria warm themselves by a fire at sunset in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria warm themselves by a fire at sunset in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria drive to position themselves in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria position themselves in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria distribute food aid to internally displaced Syrians that fled the town of Sabaa Zlam in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria carry their weapons on the back of a pick-up truck in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria prepare their weapons in the southwestern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria carry their weapons on the back of a pick-up truck in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

Fighters from the Democratic Forces of Syria carry their weapons in Ghazila village after taking control of the town from Islamic State forces in the southern countryside of Hasaka, Syria February 17, 2016. Picture taken February 17, 2016. REUTERS/Rodi Said

A Palestinian boy receives sweet from a Hamas militant as he takes part with others in the funeral of their two comrades, who were killed when a tunnel collapse on Tuesday, in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Two militants of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem

A relative of Palestinian Hamas militant Ahmed al-Zahar, who was killed when a tunnel collapse on Tuesday, mourns during his funeral in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Zahar and another militant of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem

Relatives of Palestinian Hamas militant Ahmed al-Zahar, who was killed when a tunnel collapse on Tuesday, mourn during his funeral in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Zahar and another militant of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem

Palestinian Hamas militants take part in the funeral of their two comrades, who were killed when a tunnel collapse on Tuesday, in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Two militants of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem 

Relatives of Palestinian Hamas militant Ahmed al-Zahar, who was killed when a tunnel collapse on Tuesday, mourn during his funeral in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Zahar and another militant of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATHPalestinian militants carry the body of their comrade Ahmed al-Zahar, who was killed when a tunnel collapse on Tuesday, during his funeral in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Zahar and another militant of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem 

Relatives of Palestinian Hamas militant Ahmed al-Zahar, who was killed when a tunnel collapse on Tuesday, mourn during his funeral in the village of Al-Moghraga near central Gaza Strip, February 3, 2016. Zahar and another militant of the Palestinian Islamist Hamas group died when a tunnel, they worked inside, collapsed on Tuesday, the group’s armed wing said. Leaders of Hamas said building tunnels was in preparation for any possible confrontation with Israel in the future. REUTERS/Mohammed Salem TPX IMAGES OF THE DAY

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATHPalestinian Hamas militants sit next to bodies of their comrades who were killed when a tunnel collapsed close to the Gaza Strip's eastern border with Israel during their funeral in Gaza City, January 29, 2016. REUTERS/Mohammed Salem TPX IMAGES OF THE DAY

Taliban militants, who were arrested by Afghan police, stand during a presentation to the media in Jalalabad, Afghanistan January 20, 2016. REUTERS/ Parwiz 

Taliban militants, who were arrested by Afghan police, stand during a presentation to the media in Jalalabad, Afghanistan January 20, 2016. REUTERS/ Parwiz 

Youth walk under an Islamic State flag in Ain al-Hilweh Palestinian refugee camp, near the port-city of Sidon, southern Lebanon January 19, 2016. REUTERS/Ali Hashisho 

An Islamic State flag hangs amid electric wires over a street in Ain al-Hilweh Palestinian refugee camp, near the port-city of Sidon, southern Lebanon January 19, 2016. REUTERS/Ali Hashisho