The Cambridge University research student's brutalized body was
found a week later.
Rome prosecutors have requested that four members of Egypt's
security services face trial in relation to the case.
"Among many difficulties, the work of the Rome prosecutors'
department has led to the conclusion of investigations that have
identified a picture of grave responsibility that will soon be
subject to a trial for the consequent punishment for the guilty
parties," wrote Mattarella in a statement.
"We expect a full and adequate response from the Egyptian
authorities, which have been relentlessly called on in this
regard by the Italian diplomatic services".