Central Europe began counting the cost of deadly and devastating floods caused by Storm Boris, as the European Union pledged billions of euro in aid to affected countries and northern Italy became the latest area to be inundated by torrential rain.

In Italy, rivers flooded in three of the region’s provinces — Ravenna, Bologna and Forlì-Cesena — as local mayors asked people to stay on the upper floors or leave their houses. Those areas had been already hit by devastating floods in May 2023 ...