A trial over the disappearance and murder of student Giulio Regeni in Cairo in 2016 is "an instrument to reach the truth, which is expected to be shocking," the Italian prime minister said in an interview published on Tuesday. Italian prosecutors said on Thursday they planned to charge four senior members of Egypt's security services over their alleged role in the case of the 28-year old postgraduate student at Cambridge University, vanished in Cairo in January 2016. "This story makes us grieve, but now a trial by our judicial authorities will start... a true, serious and credible trial. This trial…