Italian police have made more than 300 arrests, seized arms and confiscated tens of millions of euro of assets in an operation against the 'Ndrangheta mafia.

The crime syndicate operates in the southern region of Calabria.

The operation is the largest of its kind in about 15 years.

At least 3,000 police were involved in the operation in Calabria and several parts of northern Italy.

Suspects have been arrested for mafia association, murder, arms offences, trafficking, extortion and other crimes.

The 'Ndrangheta is one of Italy's four large organised crime syndicates.

Italy's Eurispes institute estimated the 'Ndrangheta's turnover from trafficking in drugs and arms, prostitution and extortion at €44bn.

Prosecutor Alberto Cisterna said the arrests in northern Italy 'confirm that northern Italy is the true theatre of operations for the 'Ndrangheta'.