Riot police stand guard behind a fire as refinery workers hold a blockade of the oil depot of Douchy-Les-Mines to protest against the government's proposed labour reforms, on May 25, 2016. Refinery workers stepped up strikes that threaten to paralyse France weeks ahead of the Euro 2016 tournament as the government moved to break their blockades, escalating a three-month tug-of-war over labour reforms. (Photo by François L.O./AFP Photo)

Ukrainians pour water on each other on a street in Lviv, Ukraine, 02 May 2016. The tradition of pouring water was an ancient spring ritual of cleansing on first Monday after Orthodox Easter. (Photo by Mykola Tys/EPA)

A demonstrator is detained during May Day rallies in Santiago May 1, 2013. (Photo by Ivan Alvarado/Reuters)

Participants of the the goth festival “Wave Gothic Festival” walk in fancy costumes along the festival area in Leipzig, central Germany, Saturday, May 23, 2015. About 20,000 members of the scene are expected to attend one of the world's largest gothic and “dark” culture festivals until May 25, 2015. (Photo by Jens Meyer/AP Photo)

A man wears a protective face mask as he walks along the main market in downtown after the government eased the restrictions on movement aimed at containing the spread of the coronavirus disease (COVID-19), in Amman, Jordan on April 29, 2020. (Photo by Muhammad Hamed/Reuters)

A man dressed in Andean attire as “Ukukus” or “Pabluchas”, a traditional character that acts as a vigilante imposing social order, uses a whip as a threat to force people to maintain their distance and remind them to wear face masks and gloves as a preventive measure against the novel coronavirus COVID-19, in the Vinocanchon market area in San Jeronimo district, close to the Peruvian Andean city of Cusco, on May 2, 2020. The government has identified public markets as major hotspots of the new coronavirus in Peru, where 40,459 confirmed cases and 1,124 deaths were reported on May 1. (Photo by Jose Carlos Angulo/AFP Photo)

Workers fold up a billboard to prepare for the coming of typhoon Vongfong, in Manila, Philippines on Thursday May, 14, 2020. The first typhoon to hit the country this year roared toward the eastern Philippines on Thursday as authorities work to evacuate tens of thousands of people while avoiding overcrowding in shelters that could spread the coronavirus. (Photo by Aaron Favila/AP Photo)

A woman is arrested during a mass gathering protest organised by the group called “UK Freedom Movement”, in Hyde Park in London as the country is in lockdown to help stop the spread of coronavirus, Saturday, May 16, 2020. The group claims that the coronavirus lockdown is illegal. (Photo by Kirsty Wigglesworth/AP Photo)