Soldiers wear masks as they change guard at the Tomb of the Unknown Soldier in Warsaw, Poland April 16, 2020. Jacek Marczewski/Agencja Gazeta via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. POLAND OUT. NO COMMERCIAL OR EDITORIAL SALES IN POLAND.
Soldiers wear masks as they change guard at the Tomb of the Unknown Soldier in Warsaw, Poland April 16, 2020.
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