MILAN—More than 30 people suspected of belonging to the 'Ndrangheta have been arrested by the police in Lombardy and other regions of Italy since early morning Tuesday.

 As the investigation into the branch of the Calabrian mafia operating in the Brianza region in North Italy comes to a close, the police have carried out a series of arrests of alleged members, followed by sequestration of personal property, real estate and businesses worth tens of millions of euros.

 The suspects were captured on charges of criminal association, exploitation, extortion, corruption, and use of violence and intimidation. In the course of the investigation, a clandestine bank was tracked down in Seveso (Monza), used by the organisation for laundering profits derived from the above mentioned criminal practices, made possible thanks to a vast network of associates, but also a collusion between entrepreneurs and post office and bank employees. Thus accumulated capital was then exported to Switzerland and San Marino, and reused by the organisation within the building sector, in areas such as public works, tenders, transport and renewable energy sources.