People take part in a May Day demonstration respecting the social security distance in Lisbon. AFP / PATRICIA DE MELO MOREIRA

Labour union workers maintain social distancing as they carry placards during a May Day rally in Karachi. AFP / Asif HASSAN

A volunteer sprays disinfectant as Muslim devotees offer Friday prayers during Islamic holy fasting month of Ramadan in a filed in Guzargah, north-east of Herat. AFP / HOSHANG HASHIMI

Team GB Gymnast, Dominick Cunningham trains at a horse stables in Walsall, following the outbreak of the coronavirus disease (COVID-19), Walsall, Britain. REUTERS/Carl Recine

A man is detained as trade union leaders attempt to defy a ban and march on Taksim Square to celebrate May Day in Istanbul. REUTERS/Umit Bektas

Surfers wait for waves as the sun goes down the day before the beach is scheduled to close during the coronavirus outbreak in Newport Beach, Calif. (AP Photo/Mark J. Terrill)