Protesters hurl petrol bombs as they clash with riot police, during a demonstration against the death in Minneapolis police custody of George Floyd, outside the U.S. embassy in Athens, Greece, June 3, 2020. REUTERS/Alkis Konstantinidis

Protesters hurl petrol bombs as they clash with riot police, during a demonstration against the death in Minneapolis police custody of George Floyd, outside the U.S. embassy in Athens, Greece, June 3, 2020. REUTERS/Alkis Konstantinidis

Protesters hurl petrol bombs as they clash with riot police, during a demonstration against the death in Minneapolis police custody of George Floyd, outside the U.S. embassy in Athens, Greece, June 3, 2020. REUTERS/Alkis Konstantinidis

A protester throws a colored smoke bomb during a protest against the death in Minneapolis in police custody of African-American man George Floyd, in Atlanta, Georgia, U.S. June 1, 2020. REUTERS/Dustin Chambers

Abdirahman Aden Mohamed sits outside the Madina hospital after he got injured when a minibus struck a roadside bomb at Hawa Abdi village, northwest of Mogadishu, Somalia May 31, 2020. REUTERS/Feisal Omar

A paramedic and civilians at the Madina hospital assist an injured woman after a minibus struck a roadside bomb at Hawa Abdi village, northwest of Mogadishu, Somalia May 31, 2020. REUTERS/Feisal Omar

A paramedic at the Madina hospital carries an injured child after a minibus struck a roadside bomb at Hawa Abdi village, northwest of Mogadishu, Somalia May 31, 2020. REUTERS/Feisal Omar

An Afghan man takes pictures of a bus which was carrying employees of an Afghan television station and was bombed, in Kabul, Afghanistan May 30, 2020. REUTERS/Omar Sobhani

A wreckage of a bus which carried employees of an Afghan television station and was bombed is seen in Kabul, Afghanistan May 30, 2020. REUTERS/Omar Sobhani

Afghan security forces keep watch at the side of a bomb blast in Kabul, Afghanistan May 30, 2020. REUTERS/Omar Sobhani

An Afghan official inspects the wreckage of a bus which carried employees of an Afghan television station and was bombed, in Kabul, Afghanistan May 30, 2020. REUTERS/Omar Sobhani

A man and a woman hold their ears after the explosion of a flash bomb fired by police at protestors gathered near the Minneapolis Police third precinct after a white police officer was caught on a bystander's video pressing his knee into the neck of African-American man George Floyd, who later died at a hospital, in Minneapolis, Minnesota, U.S. May 27, 2020. REUTERS/Eric Miller

Members of the police, wearing face masks, searches an area for bombs, before a protest against a mass for the Nazi collaborators, in Sarajevo, Bosnia and Herzegovina, May 16, 2020. REUTERS/Dado Ruvic

A member of the police searches an area for bombs, before a protest against a mass for the Nazi collaborators, in Sarajevo, Bosnia and Herzegovina, May 16, 2020. REUTERS/Dado Ruvic

A general view of a GBU-12 Paveway laser-guided bomb and a General Atomics MQ-9 Reaper drone during a visit of French Defence Minister Florence Parly to the French Air Force pilot school at the BA 709 military air base of Cognac-Chateaubernard in Chateaubernard, France May 14, 2020. Mehdi Fedouach/Pool via REUTERS

A general view of a GBU-12 Paveway laser-guided bomb and a General Atomics MQ-9 Reaper drone during a visit of French Defence Minister Florence Parly to the French Air Force pilot school at the BA 709 military air base of Cognac-Chateaubernard in Chateaubernard, France May 14, 2020. Mehdi Fedouach/Pool via REUTERS

A police officer stands outside the presidential palace after a bomb threat, in Vienna, Austria April 29, 2020. REUTERS/Leonhard Foeger

Police officers stand outside the presidential palace after a bomb threat, in Vienna, Austria April 29, 2020. REUTERS/Leonhard Foeger

A police officer walks outside the presidential palace after a bomb threat, in Vienna, Austria April 29, 2020. REUTERS/Leonhard Foeger

An Afghan man removes broken glass after a suicide bomb blast in Kabul, Afghanistan April 29, 2020. REUTERS/Omar Sobhani TPX IMAGES OF THE DAY

Neighbours stand on their balcony alongside a Basque flag with a black ribbon, on the 83rd anniversary of the bombing of the Basque town of Guernica by Germany's Condor Legion, in Guernica, Spain, April 26, 2020, during the coronavirus disease (COVID-19) outbreak. REUTERS/Vincent West

Family members of the victims killed at St. Sebastian's church, one of the churches attacked in the April 21st Easter Sunday Islamic militant bombings, react at a spot where the explosion happened, during the first year anniversary in Katuwapitiya village, in Negombo, Sri Lanka April 21, 2020. REUTERS/Dinuka Liyanawatte

A family member of the victims killed at St. Sebastian's church, one of the churches attacked in the April 21st Easter Sunday Islamic militant bombings, reacts near the mass graveyard during the first year anniversary in Katuwapitiya village, in Negombo, Sri Lanka April 21, 2020. REUTERS/Dinuka Liyanawatte

A Holy Cross reflected in a glass on top of the damaged tiles where the explosion happened at St. Sebastian's church, one of the churches attacked in the April 21st Easter Sunday Islamic militant bombings, is seen during the first year anniversary, in Katuwapitiya village, in Negombo, Sri Lanka April 21, 2020. REUTERS/Dinuka Liyanawatte

Washington State Patrol use bomb dogs to investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

A pigeon walks past the finish line of the Boston Marathon on the event anniversary of the 2013 Boston Marathon bombings amid the coronavirus disease (COVID-19) outbreak in Boston, Massachusetts, U.S., April 15, 2020. REUTERS/Brian Snyder

A woman takes a photograph of the finish line of the Boston Marathon on the event anniversary of the 2013 Boston Marathon bombings amid the coronavirus disease (COVID-19) outbreak in Boston, Massachusetts, U.S., April 15, 2020. REUTERS/Brian Snyder

Washington State Patrol use bomb dogs to investigate a bomb threat at the Community Corrections Field Office located on the outside grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond?

A Monroe Police officer wears a mask during the investigation of a bomb threat outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

A Monroe Police Officer (R) and a Washington State Patrol K-9 officer investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

Washington State Patrol use bomb dogs to investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

A Washington State Patrol K-9 officer pets a bomb dog after investigating a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

Washington State Patrol and Monroe Police officers investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

Washington State Patrol use bomb dogs to investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

A member of the Washington State Patrol uses a bomb dog to investigate a bomb threat at the Community Corrections Field Office located outside the grounds of the Twin Rivers Unit of the Monroe Correctional Complex, the site of a recent inmate protest after several inmates and staff tested positive for COVID-19, as efforts continue to help slow the spread of the coronavirus disease (COVID-19) in Monroe, Washington, U.S. April 14, 2020. REUTERS/Jason Redmond

An entrance of the University Hospital is seen after a World War II bomb was found on the grounds and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

An entrance of the University Hospital is seen after a World War II bomb was found on the grounds and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

The entrance of the main building is seen after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

Medical staff transfer patients to ambulances after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

Medical staff transfer patients to ambulances after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

Medical staff transfer patients to ambulances after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

Medical staff transfer patients to ambulances after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

Medical staff transfer patients to ambulances after a World War II bomb was found on the grounds of the University Hospital and a partial evacuation was ordered, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany, April 2, 2020. REUTERS/Thilo Schmuelgen

A car bomb scene is seen after an explosion in front of the government's Southern Border Provinces Administrative Centre in Yala, Thailand March 17, 2020. REUTERS/Surapan Boonthanom

Security personnel inspect the site of a car bomb after if exploded in front of the government's Southern Border Provinces Administrative Centre in Yala, Thailand March 17, 2020. REUTERS/Surapan Boonthanom

Security personnel inspect the site of a car bomb after if exploded in front of the government's Southern Border Provinces Administrative Centre in Yala, Thailand March 17, 2020. REUTERS/Surapan Boonthanom

Soccer Football - Champions League - Round of 16 Second Leg - Liverpool v Atletico Madrid - Anfield, Liverpool, Britain - March 11, 2020 General view of Liverpool fans displaying a banner amongst the red smoke caused by flares and smoke bombs outside the stadium before the match Action Images via Reuters/Carl Recine

Members of all-female landmines clearance team listen to their captain before their morning work at a bombs and landmines exhibition in Quang Tri province, Vietnam March 4, 2020. Picture taken March 4, 2020. REUTERS/Kham

Members of all-female landmines clearance team walk past the shells of U.S. military bombs used during Vietnam War, at a bombs and landmines exhibition in Quang Tri province, Vietnam March 4, 2020. Picture taken March 4, 2020. REUTERS/Kham

Members of all-female landmines clearance team look at a sample of B-bomb at a bombs and landmines exhibition in Quang Tri province, Vietnam March 4, 2020. Picture taken March 4, 2020. REUTERS/Kham

Shells of U.S. bombs used during Vietnam War are displayed at a bombs and landmines exhibition in Quang Tri province, Vietnam March 4, 2020. Picture taken March 4, 2020. REUTERS/Kham

A slingshot and petrol bombs are pictured on the rooftop of a house in a riot affected area following clashes between people demonstrating for and against a new citizenship law in New Delhi, India, February 27, 2020. REUTERS/Adnan Abidi

A demonstrator, who opposes the building of a new closed migrant detention centre, prepares to throw a petrol bomb at riot police during clashes, in the area of Diavolorema on the island of Lesbos, Greece, February 26, 2020. REUTERS/Costas Baltas

A man supporting a new citizenship law throws a petrol bomb at a Muslim shrine during a clash with those opposing the law in New Delhi India, February 24, 2020. REUTERS/Danish Siddiqui

People take cover inside a bomb shelter as a siren sounds warning of incoming rockets in Sderot, southern Israel February 24, 2020. REUTERS/Ronen Zvulun

A member of a bomb disposal squad from Gujarat Police uses a sniffer dog to scan the stands at Sardar Patel Gujarat Stadium, where U.S. President Donald Trump is scheduled to address a "Namaste Trump" event with Indian Prime Minister Narendra Modi during his to visit, in Ahmedabad, India, February 21, 2020. REUTERS/Amit Dave

Members of a bomb disposal squad from Gujarat Police scan the stands at Sardar Patel Gujarat Stadium, where U.S. President Donald Trump is scheduled to address a "Namaste Trump" event with Indian Prime Minister Narendra Modi during his to visit, in Ahmedabad, India, February 21, 2020. REUTERS/Amit Dave