The Seveso river’s anti-flood storage tank was activated while the Lambro river overflowed its banks early on Thursday due to torrential rain in Milan and in the Lombardy region.
Local authorities said an estimated 35-40 millimetres of rain had fallen since 3 in the morning in Italy’s financial capital.
The park around the Lambro river was flooded and two communities living in the area were evacuated.
The weather is expected to improve in the afternoon, according to forecasts.