Olympics - Tokyo 2020 Olympic Games Test Event - Athletics - Olympic Stadium, Tokyo, Japan - May 9, 2021. A message regarding safe distancing measures amid the coronavirus disease (COVID-19) pandemic is shown on a screen at the stadium before the start of the morning session of the Athletics test event. REUTERS/Issei Kato

Olympics - Tokyo 2020 Olympic Games Test Event - Athletics - Olympic Stadium, Tokyo, Japan - May 9, 2021. A message regarding safe distancing measures amid the coronavirus disease (COVID-19) pandemic is shown on a screen at the stadium before the start of the morning session of the Athletics test event. REUTERS/Issei Kato

Candidates of the London mayoral election stand socially distanced apart as they wait for the results at the City Hall in London, Britain, May 8, 2021. REUTERS/Henry Nicholls

Formula One F1 - Spanish Grand Prix - Circuit de Barcelona-Catalunya, Barcelona, Spain - May 6, 2021 General view of the media and F1 team members socially distanced during interviews ahead of the Spanish Grand Prix REUTERS/Albert Gea

A woman puts up signs advising voters to maintain social distancing at a voting station at Fulwell Mill ahead of local elections, amid the coronavirus disease (COVID-19) pandemic, in Sunderland, Britain May 6, 2021. REUTERS/Lee Smith

Signs pointing the way to a polling station and advising voters to maintain social distancing are seen at Fulwell Mill ahead of local elections, amid the coronavirus disease (COVID-19) pandemic, in Sunderland, Britain May 6, 2021. REUTERS/Lee Smith

A security member walks as flames and smoke rising from oil wells are seen in the distance at the Bai Hassan oilfield, which was attacked by militants, close to the northern Iraqi city of Kirkuk, Iraq, May 5, 2021. REUTERS/Ako Rasheed

A worker holds a sign to remind visitors to practice social distancing at a coronavirus disease (COVID-19) vaccination centre in Kuala Lumpur, Malaysia May 5, 2021. REUTERS/Lim Huey Teng

A couple sit under an umbrella amidst empty stadium seats, which depict the colours of the Russian state flag and display signs requesting to keep a social distance amid the coronavirus disease (COVID 19) outbreak, during a football match in Stavropol, Russia May 4, 2021. REUTERS/Eduard Korniyenko TPX IMAGES OF THE DAY

Voters, wearing protective face masks and keeping social distance, queue to cast their votes at a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue to cast their votes at a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera TPX IMAGES OF THE DAY

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Juan Medina

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Juan Medina

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Juan Medina

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Juan Medina

Voters, wearing protective face masks and keeping social distance, queue outside a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Juan Medina

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue to access a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue outside a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

A Catholic nun keeps social distance as she waits for her turn to vote during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue outside a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue outside a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Voters, wearing protective face masks and keeping social distance, queue outside a polling station during Madrid's Regional elections, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

A social distancing marker is seen on the floor of a polling station before the start of the Madrid's Regional elections day, in Madrid, Spain, May 4, 2021. REUTERS/Susana Vera

Diving - FINA Diving World Cup 2021 and Tokyo 2020 Olympics Aquatics Test Event - Tokyo Aquatics Centre, Tokyo, Japan - May 3, 2021 Athletes wearing protective face masks sit at a social distance during the women’s 3m springboard semi final REUTERS/Naoki Ogura

A man is doused by a water cannon during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman TPX IMAGES OF THE DAY

A person trows back a tear gas grenade during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers take position during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A person trows object during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A man gestures as police officers take position during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People are reflected on a police vehicle as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers detain people during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers detain a person during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police detain people during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A police officer holds his weapon during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers detain a person during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People hide as police use water cannon during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People are doused by water cannon as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers stand guard during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A police vehicle pushes burning wood during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A police vehicle pushes burning wood during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Detained men lie on the ground during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People react during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A woman throws an object at police vehicle during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People stand in front of police officers during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A man throws an object during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People struggle as police officers look on as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A person wears a horse mask as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Men are seen during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People clash against each other as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A man throws a piece of wood during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A police officer sprays tear gas at a man during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People are doused by water cannon during clashes as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

Police officers carry shields during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A man is detained by police officers during clashes as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

People clash with the police as they gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman

A man rides a bicycle past police officers as people gather at the Bois de la Cambre/Ter Kamerenbos park for a party called "La Boum 2" in defiance of Belgium's coronavirus disease (COVID-19) social distancing measures and restrictions, in Brussels, Belgium May 1, 2021. REUTERS/Yves Herman