A member of the Iraqi security forces stands guard at an oil burner in al-Zubair oil field, near Basra, Iraq April 21, 2020. REUTERS/Essam al-Sudani 

Paris police bomb squad inspects a car in Champs Elysees avenue in Paris, France, September 16, 2018. REUTERS/Gonzalo Fuentes 

Shi'ite fighters from Saraya al-Salam, who are loyal to radical cleric Muqtada al-Sadr, gather at site of a suicide attack at the entrance of the Shi'ite Mausoleum of Sayid Mohammed bin Ali al-Hadi in Balad, north of Baghdad, Iraq, July 8, 2016. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY

U.S. volunteer John Cole, 23, carries his assault rifle at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah

U.S. volunteer John Cole (C), 23, carries his assault rifle at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah TPX IMAGES OF THE DAY

U.S. volunteer John Cole (L), 23, sits next to a Kurdish fighter at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah

U.S. volunteer John Cole, 23, smokes a cigarette as he holds his assault rifle at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah

U.S. volunteer John Cole, 23, smokes a cigarette at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah

U.S. volunteer John Cole, 23, smokes a cigarette at a checkpoint in Makhmour, Iraq April 17, 2016. REUTERS/Ahmed Jadallah

French Army forces take part in a mock terrorist attack drill at a "fan zone" inside the National Police school in Nimes, France, in preparation of security measures for the UEFA 2016 European Championship, March 17, 2016. REUTERS/Jean-Paul Pelissier

A policeman performs a body search at the entrance of the hospital in the town of Ben Guerdan, Tunisia, near the Libyan border March 9, 2016. REUTERS/Zoubeir Souissi 

A Tunisian police officer stands guard near a police station after Monday's attack by Islamist fighters on an army and police barracks in the town of Ben Guerdan, Tunisia, near the Libyan border March 9, 2016. REUTERS/Zoubeir Souissi 

Security officers stand guard near the site where a military vehicle was damaged by a remote control bomb, near Diyarbakir, Turkey February 18, 2016. A bomb detonated by remote control killed seven Turkish security force members travelling in a military vehicle in southeast Turkey on Thursday, security sources said, a day after a car bomb attack in the capital Ankara killed 28 people. REUTERS/Sertac Kayar 

Security officers stand guard near the site where a military vehicle was damaged by a remote control bomb, near Diyarbakir, Turkey February 18, 2016. A bomb detonated by remote control killed seven Turkish security force members travelling in a military vehicle in southeast Turkey on Thursday, security sources said, a day after a car bomb attack in the capital Ankara killed 28 people. REUTERS/Sertac Kayar 

A Turkish soldier stands guard near site where a military vehicle was damaged by a remote control bomb, near Diyarbakir, Turkey February 18, 2016. A bomb detonated by remote control killed seven Turkish security force members travelling in a military vehicle in southeast Turkey on Thursday, security sources said, a day after a car bomb attack in the capital Ankara killed 28 people. REUTERS/Sertac Kayar 

Rangers react as employees of the Pakistan International Airlines (PIA) chant slogans as they march towards the Jinnah International Airport during a protest in Karachi, Pakistan, February 2, 2016. REUTERS/Akhtar Soomro 

Blood stains and flak jackets used by attackers remain in the hallway of a dormitory where a militant attack took place, at Bacha Khan University in Charsadda, Pakistan January 20, 2016. REUTERS/Caren Firouz TPX IMAGES OF THE DAY

Police secure the area after an explosion near the Ottoman-era Sultanahmet mosque, known as the Blue mosque in Istanbul, Turkey January 12, 2016. Ten people were killed and fifteen others were wounded after a large explosion rocked a central Istanbul square on Tuesday, a statement from the Istanbul governor's office said. REUTERS/Murad Sezer

Police secure the area after an explosion near the Ottoman-era Sultanahmet mosque, known as the Blue mosque in Istanbul, Turkey January 12, 2016. Ten people were killed and fifteen others were wounded after a large explosion rocked a central Istanbul square on Tuesday, a statement from the Istanbul governor's office said. REUTERS/Murad Sezer

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France, January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Benoit Tessier

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France, January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Benoit Tessier TPX IMAGES OF THE DAY 

Kurdish fighters from the People's Protection Units (YPG), who are fighting alongside with the Democratic Forces of Syria, are seen at the eastern entrance of the the Tishrin dam, after they captured it on Saturday from Islamic State militants, south of Kobani, Syria December 27, 2015. A U.S.-backed alliance of Syrian Kurds and Arab rebel groups, supported by U.S. coalition planes, captured a dam on Saturday from Islamic State, cutting one of its main supply routes across the Euphrates, an alliance spokesman said. REUTERS/Rodi Said 

Boulder area SWAT personnel are seen after a candidate forum held by CNBC before the U.S. Republican presidential candidates debate in Boulder, Colorado, October 28, 2015. REUTERS/Evan Semon

A boy walks past soldiers from the Saudi-led coalition patrolling a street in Yemen's southern port city of Aden September 26, 2015. As Gulf-backed forces assemble in Marib province east of Sanaa ahead of a widely expected thrust towards the Houthi-held capital, the fate of Aden and its hinterland may offer a glimpse at whether some form of central government can be resurrected. Picture taken September 26, 2015. To match Insight YEMEN-SECURITY/ADEN REUTERS/Faisal Al Nasser 

A soldier from the Saudi-led coalition walks past a broken-down tank on a street in Yemen's southern port city of Aden September 27, 2015. As Gulf-backed forces assemble in Marib province east of Sanaa ahead of a widely expected thrust towards the Houthi-held capital, the fate of Aden and its hinterland may offer a glimpse at whether some form of central government can be resurrected. To match Insight YEMEN-SECURITY/ADEN REUTERS/Faisal Al Nasser 

Niger soldiers provide security for an anti-Boko Haram summit in Diffa city, Niger September 3, 2015. Picture taken September 3, 2015. To match Exclusive USA-NIGER/BOKO HARAM REUTERS/Warren Strobel 

Kevin Finnegan (L) hands out a new bulletproof vests to a Chicago police officer in Chicago, Illinois, September 14, 2015. The vests were purchased through funds donated to the Chicago Police Memorial Foundation as part of program which hopes to replace 8,000 vests that were deemed to be outdated. REUTERS/Jim Young

Kevin Finnegan searches through boxes of new bulletproof vests to be handed out to Chicago police officers in Chicago, Illinois, September 14, 2015. The vests were purchased through funds donated to the Chicago Police Memorial Foundation as part of program which hopes to replace 8,000 vests that were deemed to be outdated. REUTERS/Jim Young

Kevin Finnegan (L) checks the fitting of a new bulletproof vest on Chicago police officer Robert Young in Chicago, Illinois, September 14, 2015. The vests were purchased through funds donated to the Chicago Police Memorial Foundation as part of program which hopes to replace 8,000 vests that were deemed to be outdated. REUTERS/Jim Young

Kevin Finnegan (R) hands out a new bulletproof vest to a Chicago police officer in Chicago, Illinois, September 14, 2015. The vests were purchased through funds donated to the Chicago Police Memorial Foundation as part of program which hopes to replace 8,000 vests that were deemed to be outdated. REUTERS/Jim Young

Taiwan's President Ma Ying-jeou (C) waves during the annual Han Kuang military exercise in Hsinchu county, northern Taiwan, September 10, 2015. The annual drills, which run this week and are the island's most important war games, also included simulations of a scenario in which Chinese submarines attack one of Taiwan's Islands that lies close to the mainland but are repelled by Taiwanese amphibious forces. REUTERS/Pei Chen/Pool 

Taiwan's President Ma Ying-jeou (C) salutes during the annual Han Kuang military exercise in Hsinchu county, northern Taiwan, September 10, 2015. The annual drills, which run this week and are the island's most important war games, also included simulations of a scenario in which Chinese submarines attack one of Taiwan's Islands that lies close to the mainland but are repelled by Taiwanese amphibious forces. REUTERS/Pei Chen/Pool 

Palestinian Hamas militants take part in an anti-Israel military parade in Gaza City August 26, 2015. REUTERS/Suhaib Salem 

David Sweat (center R) appears in court with his appointed defense attorney Joseph Mucia for his arraignment at Clinton County court, in Plattsburgh, New York August 20, 2015. Sweat, 35, one of the convicted killers who led law enforcement on an intense three-week manhunt after escaping a maximum-security prison in upstate New York, pleaded not guilty to an escape charge on Thursday. REUTERS/Christinne Muschi 

David Sweat appears (L) in court for his arraignment at Clinton County court, in Plattsburgh, New York August 20, 2015. Sweat, 35, one of the convicted killers who led law enforcement on an intense three-week manhunt after escaping a maximum-security prison in upstate New York, pleaded not guilty to an escape charge on Thursday. REUTERS/Christinne Muschi 

A woman looks out from a window of her room as policemen secure the crime scene after Kumar Shrestha, also known as Kumar Ghainte, after he was shot dead during what local media termed as a police encounter in Kathmandu, Nepal August 20, 2015. According to local media, three police personnel and two of the gangster's friends were also injured in the incident. REUTERS/Navesh Chitrakar 

Nepalese policemen arrest a supporter of Kumar Shrestha, also known as Kumar Ghainte, after he was shot dead during what local media termed as a police encounter in Kathmandu, Nepal August 20, 2015. According to local media, three police personnel and two of the gangster's friends were also injured in the incident. REUTERS/Navesh Chitrakar? 

Anti-terrorist special forces patrol during a news conference on a rescue operation, at Mazamari military base in the Amazon province of Satipo, Peru, August 1, 2015. Peruvian special forces rescued another 7 children and 8 men and women on Friday, some of whom had been raped and held captive for three decades, when they made another raid in a southeastern jungle camp of the left-wing Shining Path rebel group. Special forces rescued 36 more people in the same condition in an earlier raid this week, local media reported. The captives, many belonging to the Ashaninka indigenous group, were held in 'production camps' where women and children were forced to work in the fields, Vice Defence Minister Ivan Vega told local reporters earlier this week. REUTERS/Mariana Bazo

An Israeli border policeman fires a tear gas canister towards Palestinians during clashes following the funeral of Palestinian youth Laith al-Khaldi, in Jalazoun refugee camp near the West Bank city of Ramallah August 1, 2015. Al-Khaldi died on Saturday at a West Bank hospital following a clash with Israeli troops near Ramallah, Palestinian hospital officials said. The confrontation was one of three in a matter of hours in which Palestinians died from Israeli-Palestinian violence on one of the most tense days in the occupied West Bank and the Gaza Strip in recent months. Israeli soldiers fired at the Palestinian after he threw a fire-bomb at them, the military said. REUTERS/Mohamad Torokman

Palestinian militants fire weapons in the air during the funeral of Palestinian youth Laith al-Khaldi near the West Bank city of Ramallah August 1, 2015. Al-Khaldi died on Saturday at a West Bank hospital following a clash with Israeli troops near Ramallah, Palestinian hospital officials said. The confrontation was one of three in a matter of hours in which Palestinians died from Israeli-Palestinian violence on one of the most tense days in the occupied West Bank and the Gaza Strip in recent months. Israeli soldiers fired at the Palestinian after he threw a fire-bomb at them, the military said. REUTERS/Mohamad Torokman

Chadian peacekeepers stand guard at the Minusma peacekeeping base in Kidal, Mali, July 22, 2015. REUTERS/Adama Diarra 

Soldiers loyal to Yemeni President Abd-Rabbu Mansour Hadi stand near their vehicle at an army post in al-Abr on Yemen's northeastern border with Saudi Arabia July 9, 2015. A humanitarian ceasefire for Yemen is expected to be announced within 24 hours, the news agency of the dominant, Iranian-allied Houthi group quoted the U.N. special envoy to the country as saying. REUTERS/Stringer

Palestinians Hamas militants march during an anti-Israel rally in Gaza City July 8, 2015. July 8th marks the one-year anniversary of the war between Israel and Hamas in Gaza. The 50-day conflict began after Israel said it was determined to put an end to constant rocket-fire from Gaza, launching an intense air and ground assault to do so. It was the third major conflict between Israel and Hamas militants since the Islamist group seized control of Gaza in 2007. The fighting killed more than 2,100 Palestinians, most of them civilians, as well as 73 Israelis, most of them soldiers. More than 100,000 buildings in Gaza were left damaged or destroyed. None has yet been rebuilt. REUTERS/Suhaib Salem 

The suspect held over an attack against a gas company site is escorted by police officers during investigations in Saint-Priest, near Lyon, France, June 28, 2015. Yassin Salhi, 35, told detectives he had killed Herve Cornara in a parking area before arriving at the plant in Saint Quentin-Fallavier, 30 km (20 miles) south of Lyon, where he attempted to cause an explosion on Friday, the source told Reuters. REUTERS/Emmanuel Foudrot 

A member of Uzbekistan's national security service, the SNB, stands guard during an operation to destroy drugs at a metallurgical plant outside the capital Tashkent, Uzbekistan, June 25, 2015. Drug enforcement officers in Uzbekistan burned 1.4 tonnes of drugs on Thursday, as Central Asia's most populous nation fights to stem the flow of narcotics from neighbouring Afghanistan to Russia and further on to Europe. Heaps of drugs, including 133.3 kilos (294 pounds) of heroin and 775 kilos (1,709 pounds) of opium, were incinerated in a furnace at a metallurgical plant outside the Uzbek capital Tashkent before an audience of diplomats, workers at international organisations and reporters. REUTERS/Muhammadsharif Mamatkulov 

A Turkish soldier stands guard as Syrian refugees wait to cross into Turkey from the Syrian town of Tal Abyad, near Akcakale in Sanliurfa province, Turkey, June 10, 2015. REUTERS/Osman Orsal 

A local resident carries bread as a Ukrainian serviceman stands guard in the village of Novotoshkivske near the frontline with pro-Russian separatists, eastern Ukraine, June 8, 2015. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY

Members of the Ukrainian armed forces look out from a blindage at their positions in the village of Pisky (Pesky) near the local airport, north-west of Donetsk, Ukraine, June 5, 2015. REUTERS/Oleksandr Klymenko TPX IMAGES OF THE DAY

A member of the Ukrainian armed forces is seen at his position in the town of Maryinka, eastern Ukraine, June 5, 2015. Ukraine's president told his military on Thursday to prepare for a possible "full-scale invasion" by Russia all along their joint border, a day after the worst fighting with Russian-backed separatists in months. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY

Fellow marines pay their respects to members of the 3rd Marine Aircraft Wing, who were killed in the crash of their military helicopter while coming to the aid of earthquake victims in Nepal, during a memorial service at Camp Pendleton, California June 3, 2015. REUTERS/Mike Blake TPX IMAGES OF THE DAY

Lilian Tintori, wife of jailed Venezuelan opposition leader Leopoldo Lopez, gestures while talking to an officer of the National Bolivarian Guard, outside the military prison of Ramo Verde, on the outskirts of Caracas May 29, 2015. Former Latin American presidents Andres Pastrana from Colombia and Jorge Quiroga from Bolivia were blocked on Friday from visiting jailed Venezuelan opposition leader Leopoldo Lopez, who was arrested last year after leading protests against the government of President Nicolas Maduro. REUTERS/Marco Bello

Police inspect the site of a blast that occurred during the cricket match between Pakistan and Zimbabwe, near Gaddafi Stadium in Lahore, Pakistan, May 29, 2015. At least three people were injured in the blast, according to local media. Zimbabwe is the first cricket test-playing nation to tour Pakistan since a 2009 terror attack on the Sri Lanka cricket team bus in Lahore. REUTERS/Stringer 

Members of al Qaeda's Nusra Front ride on a pick-up truck mounted with an anti-aircraft weapon in the town of the northwestern city of Ariha, after a coalition of insurgent groups seized the area in Idlib province, May 29, 2015. The Syrian army has pulled back from the northwestern city of Ariha after a coalition of insurgent groups seized the last city in Idlib province in northwestern Syria near the Turkish border that was still held by the government. A coalition of rebel groups called Jaish al Fateh, or Conquest Army, said it had taken over the city. Syria's al Qaeda offshoot Nusra Front is a major part of the coalition. REUTERS/Ammar Abdullah 

Immigration enforcement officers raid a home in Southall in west London, Britain, May 21, 2015. REUTERS/Richard Pohle/Pool 

Saudi soldiers take their position at Saudi Arabia's border with Yemen April 6, 2015. REUTERS/Faisal Al Nasser 

A Palestinian teen argues with an Israeli soldier during a protest marking Land Day and against Jewish settlements in the West Bank village of Silwad near Ramallah March 30, 2015. Palestinians mark Land Day on March 30, the annual commemoration of protests in 1976 against Israel's appropriation of Arab-owned land in the Galilee. REUTERS/Mohamad Torokman 

A Ukrainian serviceman with a dog takes part in a search operation to deactivate and destruct ammunition in the settlement of Luhanske, Donetsk region, March 27, 2015. REUTERS/Oleksandr Klymenko

A Nigerien soldier walks out of a house that residents say a Boko Haram militant had forcefully seized and occupied in Damasak March 24, 2015. Boko Haram militants have kidnapped more than 400 women and children from the northern Nigerian town of Damasak that was freed this month by troops from Niger and Chad, residents said on Tuesday. Nigerian, Chadian and Niger forces have driven militants out of a string of towns in simultaneous offensives over the past month. REUTERS/Joe Penney 

A pro-Russian rebel takes part in shooting training in the village of Chornukhyne near the town of Debaltseve, north-east from Donetsk, March 12, 2015. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY) 

A Cameroonian soldier stands on a Nigerian armoured vehicle used by Boko Haram insurgents to attack a Cameroon army patrol near Waza, February 17, 2015. The Cameroon military destroyed it in battle on Monday. REUTERS/Bate Felix Tabi Tabe (CAMEROON - Tags: CIVIL UNREST MILITARY POLITICS)