Egyptian police detained an Italian student in Cairo because they thought he was a British spy, taking him to a security facility where he was tortured and murdered, an Italian prosecutor told a Rome court on Monday. Italy has charged four Egyptian security agents with kidnapping and killing Giulio Regeni, a postgraduate student at Britain’s Cambridge University, in Cairo in 2016. The four men are being tried in absentia and have never responded publicly to the accusations. The Egyptian authorities have repeatedly denied any state involvement in Regeni’s disappearance and death. “The overall p…