(ANSA) - Milan, September 11 - Italian police on Tuesday arrested 37 suspects in a sweep against the Calabrian-based 'Ndrangheta mafia in Lombardy, the region around Milan. Those arrested are accused of mafia association, possession of arms, loan-sharking and extortion. Police said the probe uncovered links between the well-entrenched Lombard factions of 'Ndrangheta and their original clans down in Calabria. 'Ndrangheta has been active in Lombardy and other parts of northern Italy for decades. It also has branches in Germany and other northern European countries as well as Australia and Canada.