A 20-year-old fan of Rieti basketball team has admitted throwing a stone that killed a bus driver on a coach carrying supporters of Pistoia basketball team following a second-tier clash on Sunday.     Kevin Pellecchia, arrested along with two other far-right sympathisers, was intercepted on his phone at police headquarters and reportedly admitted to throwing the rock that killed driver Raffaele Marianella.     "It was the sharpest one," is the phrase Pellecchia was quoted in the wiretap.