People wearing face masks get on a bus in Zagreb, Croatia, on June 25, 2020. (Emica Elvedji/Pixsell/Handout via Xinhua)

People wearing face masks are seen on a tram in Zagreb, Croatia, on June 25, 2020. (Emica Elvedji/Pixsell/Handout via Xinhua)

Tourists wearing face masks are seen on a boat in Dubrovnik, Croatia, on June 25, 2020. (Grgo Jelavic/Pixsell/Handout via Xinhua)

A woman wearing a face mask gets on a bus in Sibenik, Croatia, on June 25, 2020. (Dusko Jaramaz/Pixsell/Handout via Xinhua)

Tourists wearing face masks board a boat in Dubrovnik, Croatia, on June 25, 2020. (Grgo Jelavic/Pixsell/Handout via Xinhua)