The upheaval left two police officers injured and a massive damages bill in the northern city.

A total of 37 people were detained in relation to the disturbances, before they were subsequently released, and hundreds of people who took part have been identified, including people from Germany and France.

They were protesting in support of jailed Informal Anarchist Federation (FAI) leader, Alfredo Cospito, who has been on hunger strike since October to protest against the tough 41 bis prison regime he is being held under, which is usually reserved for mafia bosses.

The windows and windscreens of many cars, shops and banks were smashed and graffiti was daubed over the walls of buildings for stretches of several hundred metres.

Paint was also thrown at the Santuario della Madonna Consolata (the Pontifical Shrine of Our Lady of the Consolation), one of Turin's holiest sites.

"Criminal vandals, so-called anarchists, brought guerilla warfare to Turin yesterday," Crosetto said via Twitter.

"They destroyed shops, splattered paint over walls, used violence on people and property.

"You don't negotiate with people like this. They must be stopped, judged and punished".

ANSA