A vehicle used for suicide car bombings, made by Islamic State militants, is seen in al-Zanjili neighbourhood in western Mosul, Iraq June 6, 2017. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY 

An Islamic State suicide bomber attacks an Iraqi special forces unit with a car bomb during clashes in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

An Islamic State suicide bomber attacks an Iraqi special forces unit with a car bomb during clashes in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic 

An Islamic State suicide bomber attacks an Iraqi special forces unit with a car bomb during clashes in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic 

An Iraqi journalist reacts after an Islamic State suicide bomber attacked an Iraqi special forces unit with a car bomb during clashes in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic 

Afghan shopkeepers stand outside their shops after a car bomb attack in Kabul, Afghanistan, September 6, 2016. REUTERS/Mohammad Ismail

An Afghan man removes broken glass from a building after a car bomb attack in Kabul, Afghanistan September 6, 2016. REUTERS/Mohammad Ismail

Mannequins and glass pieces are seen in a shop after a car bomb attack in Kabul, Afghanistan, September 6, 2016. REUTERS/Mohammad Ismail

An Afghan policeman stands at the site of a car bomb attack in Kabul, Afghanistan, September 6, 2016. REUTERS/Mohammad Ismail

Afghan men stand at the site of a car bomb attack in Kabul, Afghanistan, September 6, 2016. REUTERS/Mohammad Ismail

Somali security forces assess the scene of a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

A general view shows Somali government forces securing the street near the scene of a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

Somali government forces walk past a car destroyed as they arrive to secure the scene of a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

Security forces stand guard on a destroyed building following a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

Somali security forces escort civilians following a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

Security forces assist Abdalla Boss, a Somali Member of Parliament who was wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

A general view shows Somali government forces securing at the scene of a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH ?A civilian wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace is escorted as he walks from the scene of the explosion in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH ?A civilian wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace is escorted as he walks from the scene of the explosion in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH ?Paramedics carry a civilian wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace on a stretcher from the scene of the explosion in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar

Security forces stand at the SYL hotel that was partly destroyed following a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

Security forces assist Abdalla Boss, a Somali Member of Parliament who was wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar TPX IMAGES OF THE DAY 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH ?A civilians wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace is escorted as he walks to an ambulance from near the scene of the explosion in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH ?A civilian who was wounded following a car bomb claimed by al Shabaab Islamist militants outside the president's palace stands near the scene of the explosion in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

A civilian who was wounded after a car bomb attack claimed by al Shabaab Islamist militants outside the president's palace walks away from the scene in the Somali capital of Mogadishu, August 30, 2016. REUTERS/Feisal Omar 

A view of the scene following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny TPX IMAGES OF THE DAY

Libyans gather at the scene following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny 

Libyans gather at the scene following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny 

Libyans gather at the scene following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny 

Libyans gather at the scene following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny

Libyans put out a fire following a car bomb attack in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny

People and fighters gather at the scene following a car bomb in al-Gharbiat in Sirte, Libya August 18, 2016. REUTERS/Ismail Zitouny

People gather at the site of a suicide car bomb attack over the weekend at the shopping area of Karrada in Baghdad, Iraq July 6, 2016. REUTERS/Thaier Al-Sudani 

People gather at the site of a suicide car bomb attack over the weekend at the shopping area of Karrada in Baghdad, Iraq July 6, 2016. REUTERS/Thaier Al-Sudani 

Sunni and Shi'ite Muslims attend prayers during Eid al-Fitr as they mark the end of the fasting month of Ramadan, at the site of a suicide car bomb attack over the weekend at the shopping area of Karrada, in Baghdad, Iraq July 6, 2016. REUTERS/Thaier Al-Sudani 

Sunni and Shi'ite Muslims attend prayers during Eid al-Fitr as they mark the end of the fasting month of Ramadan, at the site of a suicide car bomb attack over the weekend at the shopping area of Karrada, in Baghdad, Iraq July 6, 2016. REUTERS/Thaier Al-Sudani 

Sunni and Shi'ite Muslims attend prayers during Eid al-Fitr as they mark the end of the fasting month of Ramadan, at the site of a suicide car bomb attack over the weekend at the shopping area of Karrada, in Baghdad, Iraq July 6, 2016. REUTERS/Thaier Al-Sudani 

Mourners react during a funeral of a victim who was killed in a suicide bombing in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Mourners react during a funeral of a victim who was killed in a suicide bombing in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Mourners react during a funeral of a victim who was killed in a suicide bombing in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Mourners react during a funeral of a victim who was killed in a suicide bombing in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

A man lights a candle at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Candles are seen at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

A woman lights a candle at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

A man lights a candle at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Residents light candles at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Residents light candles at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

A man lights a candle at the site after a suicide bombing in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

A fireman hoses down a burning building after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Firemen hose down a burning building after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Firemen hose down a burning building after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Firemen hose down a burning building as civilians gather after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

Iraqi security forces and civilians gather at the site after a suicide car bomb occurred in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily 

People gather at the site of a suicide car bomb in the Karrada shopping area, in Baghdad, Iraq July 3, 2016. REUTERS/Khalid al Mousily