A person kicks a glass panel during a student-organised protest at Plaza Catalunya in Barcelona, Spain. (EPA Images pic)MADRID: Police made 128 arrests overnight in Barcelona for acts of "vandalism", damage to public property" and "looting", the regional Catalan police said on Sunday.

Seventy-three of those arrested were minors, with the reports due to be sent "to the juvenile prosecutor's office", Catalan police chief Silvia Cata told Spain's 3CatInfo media outlet.

Footage on social media showed groups of young people, many clad in all-black, attacking businesses in Barcelona after gathering in the city centre for a rally that had not been declared to the authorities.

The scenes come at a time when countries across Europe have been grappling with unrest, with France, Italy and Albania all seeing protests give way to incidents of looting and violence.