Aerial photo taken on March 22, 2020 shows a man walking along the east bank of the Vistula river in Warsaw, Poland. Poland has seen a rise in COVID-19 cases in recent days which has prompted the government to take stricter measures to limit movement of individuals. (Photos: Xinhua)

Aerial photo taken on March 22, 2020 shows an empty path in a popular nature area on the east bank of the Vistula river in Warsaw, Poland. Poland has seen a rise in COVID-19 cases in recent days which has prompted the government to take stricter measures to limit movement of individuals.

Aerial photo taken on March 22, 2020 shows a single tram running on the Slask-Dabrrowski bridge in Warsaw, Poland. Poland has seen a rise in COVID-19 cases in recent days which has prompted the government to take stricter measures to limit movement of individuals.

Aerial photo taken on March 22, 2020 shows a woman pushing a baby carriage near the east bank of the Vistula river in Warsaw, Poland. Poland has seen a rise in COVID-19 cases in recent days which has prompted the government to take stricter measures to limit movement of individuals.