 After 463 interrogations, the investigations produced 60,000 pages.He indicted in 1998 David Carrett, officer of the US Navy, on charges of political and military espionage as well as participation in the 1969 Piazza Fontana bombing.He also indicted Sergio Minetto, Italian official member of Gladio, and "pentito" Carlo Digilio, indicted in the Piazza Fontana investigation.