Dramatic mobile phone footage taken from inside office building shows the moment a tornado hit near Milan, injuring 12 people and filling the air with flying debris.

The twister swept through Grezzago, an industrial area of Milan in Italy on Monday, overturning vehicles, uprooting telegraph poles and damaging buildings.

Footage uploaded onto social media site www.youreporter.it shows the tornado swirling around the outside of an office building, hurling debris in the air.

No causalities were reported but at least 12 people were left injured by the tornado .