A fireman walks near a bus that burned on a street in Moscow, Russia, on Dec. 13, 2020. A city bus started to burn for unknown reasons on the way to a bus depot in Moscow. No casualties were reported. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A fireman works near a bus that burned on a street in Moscow, Russia, on Dec. 13, 2020. A city bus started to burn for unknown reasons on the way to a bus depot in Moscow. No casualties were reported. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People pass by a bus that burned on a street in Moscow, Russia, on Dec. 13, 2020. A city bus started to burn for unknown reasons on the way to a bus depot in Moscow. No casualties were reported. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A fireman extinguishes the fire on a bus on a street in Moscow, Russia, on Dec. 13, 2020. A city bus started to burn for unknown reasons on the way to a bus depot in Moscow. No casualties were reported. (Photo by Alexander Zemlianichenko Jr/Xinhua)