Footnote:
'Simulated' stabbing
One of the key witnesses is Michele Burgio, Mr Troiani's driver, who admits to planting petrol bombs at the school.
According to the media reports, Mr Troiani later admitted to prosecutors that fabricating evidence was a "silly thing" to do.
Attention is also focusing on a knife attack on one police officer, Massimo Nucera.
A senior police chief, Franco Gratteri, head of the Central Operations Services, is quoted as saying that the stabbing was not carried out by protesters, but was simulated.
Mr Gratteri says the "attack" could have been aimed at justifying the excessive use of violence used by some flying squads.
Hundreds of police and protesters were injured in street battles during the summit, which was attended by violent anarchists as well as peaceful protesters.
One protester died after being shot by police.
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