A protestor wears a rainbow-coloured balaclava during a demonstration on May Day, amid the spread of the coronavirus disease (COVID-19), in Berlin, Germany May 1, 2020. REUTERS/Hannibal Hanschke

A worker in a balaclava is pictured at the construction of a 200-bed temporary field hospital for people exposed to, at risk of exposure, or becoming ill with coronavirus at the Shoreline Soccer Field during the outbreak of coronavirus disease (COVID-19) in Shoreline, Washington, U.S. March 20, 2020. REUTERS/Jason Redmond

A woman wearing a balaclava and a mask over her mouth gestures at a checkpoint to an exclusion zone at the Jiujiang Yangtze River Bridge in Jiujiang, Jiangxi province, China, as the country is hit by an outbreak of a new coronavirus, February 1, 2020. REUTERS/Thomas Peter

Soccer Football - Bundesliga - 1. FC Union Berlin v Hertha BSC - Stadion An der Alten Forsterei, Berlin, Germany - November 2, 2019 1. FC Union Berlin's Marvin Friedrich reacts after fans wearing balaclavas invade the pitch after the match REUTERS/Annegret Hilse DFL regulations prohibit any use of photographs as image sequences and/or quasi-video TPX IMAGES OF THE DAY

Soccer Football - Bundesliga - 1. FC Union Berlin v Hertha BSC - Stadion An der Alten Forsterei, Berlin, Germany - November 2, 2019 A fan wearing a balaclava invades the pitch after the match REUTERS/Annegret Hilse DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - 1. FC Union Berlin v Hertha BSC - Stadion An der Alten Forsterei, Berlin, Germany - November 2, 2019 Fans wearing balaclavas invade the pitch as 1. FC Union Berlin players celebrate after the match REUTERS/Annegret Hilse DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava holds a flare REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava burns a flag with a flare REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 Borussia Dortmund fans wearing balaclavas REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava burns a flag REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava burns a flag REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video TPX IMAGES OF THE DAY

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava burns a flag REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 A Borussia Dortmund fan wearing a balaclava lets off a flare REUTERS/Thilo Schmuelgen DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 General view of a Schalke 04 fan wearing a balaclava REUTERS/Leon Kuegeler DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 General view of Schalke 04 fans wearing balaclavas REUTERS/Leon Kuegeler DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Soccer Football - Bundesliga - Schalke 04 v Borussia Dortmund - Veltins-Arena, Gelsenkirchen, Germany - October 26, 2019 General view of Schalke 04 fans wearing balaclavas REUTERS/Leon Kuegeler DFL regulations prohibit any use of photographs as image sequences and/or quasi-video

Ryan Liu, 29, of Aston Martin Racing team adjusts his balaclava in the team garage at Shanghai International Circuit in Shanghai, China September 8, 2018. Picture taken September 8, 2018. REUTERS/Aly Song

Special police forces wearing helmets are seen during a news conference at Office of the Narcotics Control Board in Bangkok, Thailand September 18, 2018. REUTERS/Athit Perawongmetha

Formula One - F1 - Chinese Grand Prix - Shanghai, China - 7/4/17 - Mercedes driver Valtteri Bottas of Finland wears a balaclava in his garage at the Shanghai International Circuit. REUTERS/Aly Song

Formula One - F1 - Australian Grand Prix - Melbourne, Australia - 24/03/2017 McLaren driver Stoffel Vandoorne of Belgium dons his fireproof balaclava in the team garage during the second practice session. REUTERS/Brandon Malone

Wearing a balaclava to keep his face warm, Terry Laekeman, 55, rides his homemade 1964 Corsair engine powered trike down Main Street during a below-freezing Friday the 13th motorcycle rally in Port Dover, Ontario, Canada January 13, 2017. For the event which is held in all seasons, the temperatures in Port Dover on Friday ranged from a low of minus five degrees Celcius (23 degrees Fahrenheit) to a high of minus one degree Celcius (30 degrees Fahrenheit). REUTERS/Peter Power

Participants attack a branch of Sberbank during a rally held by activists of nationalist groups and their supporters who mark the anniversary of the 2014 Ukrainian pro-European Union (EU) mass protests on the Day of Dignity and Freedom in Kiev, Ukraine, November 21, 2016. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

A Palestinian militant of the Democratic Front for the Liberation of Palestine (DFLP) gets out of a tunnel during a graduation ceremony in Rafah in the southern Gaza Strip November 4, 2016. REUTERS/Suhaib Salem TPX IMAGES OF THE DAY

A man in a balaclava jumps over burning debris during a protest against the recent killings in Kashmir, in Srinagar, India September 12, 2016. To match Insight INDIA-KASHMIR/ REUTERS/Danish Ismail/File Photo

A man in a balaclava jumps over burning debris during a protest against the recent killings in Kashmir, in Srinagar, India September 12, 2016. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

A man in a balaclava gestures in front of burning debris following a protest against the recent killings in Kashmir, in Srinagar, India September 12, 2016. REUTERS/Danish Ismail

Formula One - F1 - Italian Grand Prix 2016 - Monza, Italy - 02/9/16 - Red Bull's Max Verstappen of the Netherlands wears balaclava during the first free practice. REUTERS/Max Rossi

Formula One - F1 - Italian Grand Prix 2016 - Monza, Italy - 02/9/16 - Ferrari's Sebastian Vettel of Germany wears balaclava during the first free practice. REUTERS/Max Rossi

Formula One - F1 - Italian Grand Prix 2016 - Monza, Italy - 02/9/16 - Ferrari's Sebastian Vettel of Germany wears balaclava during the first free practice. REUTERS/Max Rossi

A view shows Balaclava Bay in the coastal town of Balaclava on the outskirts of Sevastopol, Crimea, July 20, 2016. REUTERS/Maxim Zmeyev

A tourist visits the Cembalo Fortress in the coastal town of Balaclava on the outskirts of Sevastopol, Crimea, July 20, 2016. REUTERS/Maxim Zmeyev

A woman looks at Balaclava Bay in the coastal town of Balaclava on the outskirts of Sevastopol, Crimea, July 20, 2016. REUTERS/Maxim Zmeyev

French President Francois Hollande (C) shakes hands with members of the RAID, the French national police intervention group, as he arrives after a hostage-taking at a church in Saint-Etienne-du-Rouvray, France, July 26, 2016. A priest was killed with a knife and another hostage seriously wounded in an attack on a church that was carried out by assailants linked to Islamic State. REUTERS/Boris Maslard/Pool

French President Francois Hollande (R) stands by members of the RAID, the French national police intervention group, as he arrives after a hostage-taking at a church in Saint-Etienne-du-Rouvray, France, July 26, 2016. A priest was killed with a knife and another hostage seriously wounded in an attack on a church that was carried out by assailants linked to Islamic State. REUTERS/Boris Maslard/Pool

Recently arrested drug trafficking suspects, including foreigners, wait for the start of an illegal narcotics destruction event at police headquarters in Jakarta, Indonesia July 21, 2016. REUTERS/Darren Whiteside

Kurdish gunmen climb the house of a Shi'ite militiaman during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish gunman climbs a house of a Shi'ite militiaman during clashes in Tuz Khurmato, Iraq, April 24, 2016.REUTERS/Goran Tomasevic

Special forces from the Kurdish Asayish forces stand with their weapons in the city of Qamishli, Syria April 21, 2016. REUTERS/Rodi Said

Belgium police officers secure the access during a police operation in Etterbeek, near Brussels, Belgium, April 9, 2016. REUTERS/Yves Herman TPX IMAGES OF THE DAY

Belgian soldiers and special forces police keep guard outside a courthouse as Paris attacks suspect Salah Abdelslam remains in police custody, in Brussels, Belgium, April 7, 2016. REUTERS/Yves Herman TPX IMAGES OF THE DAY

A masked and hooded youth writes a protest message on a cinder blocked wall as elsewhere French high school and university students attend a demonstration against the French labour law proposal in Nantes, France, April 5, 2016. REUTERS/Stephane Mahe

Soldiers stand near graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

Soldiers and policemen paint over graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

Policemen paint over graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

Soldiers stand near graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

A soldier stands near graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

Soldiers stand near graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas

Soldiers paint over graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

A soldier stands near graffiti associated with the Mara Salvatrucha gang in El Rosal neighborhood in Quezaltepeque, El Salvador April 4, 2016. According to police, army soldiers and police officers erased gang related graffiti as part of their strategy to regain control of the area around Quezaltepeque Jail from gangs and to curb violence in the country. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

Police use a robotic device as they take part in a search in the Brussels borough of Schaerbeek following Tuesday's bombings in Brussels, Belgium, March 24, 2016. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

Police control the access to the central train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

Police control the access to the central train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

Police control the access to the central train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

Police stand guard at Midi train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

A policeman stand guard at Midi train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

Police stand guard at Midi train station following bomb attacks in Brussels, Belgium, March 22, 2016. REUTERS/Christian Hartmann

Police at the scene of a security operation in the Brussels suburb of Molenbeek in Brussels, Belgium, March 18, 2016. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY

Police at the scene of a security operation in the Brussels suburb of Molenbeek in Brussels, Belgium, March 18, 2016. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY

Police at the scene of a security operation in the Brussels suburb of Molenbeek in Brussels, Belgium, March 18, 2016. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY