Milan, December 6 - The head of Juventus's Viking ultra group, Loris Giuliano Grancini, was arrested Wednesday and must serve sentences lasting 13 years and 11 months for attempted murder and other offences. Grancini, a 44-year-old factory worker, was found by Carabinieri in his home at Cernusco sul Naviglio near Milan. The attempted homicide took place in Milan's Piazza Morbegno on October 5, 2006, outside the Los Hermanos bar, when he and a friend tried to shoot dead an acquaintance called Massimo Merafino. Subsequently Grancino was accused of stabbing in the calf a friend of Merafino's, Antonio Genova, so that he would not testify against him. That attack took place outside a bar frequented by Juventus fans. Grancini and others are also accused of threatening the head of a Milanese ticketing agency to give them tickets for Juve matches.