Paola Regeni, mother of slain Italian doctoral student Giulio Regeni, arrives at the Rebibbia prison in Rome, Thursday, Oct. 14, 2021, to attend the first hearing of the trial for the death of Italian doctoral student Giulio Regeni, who disappeared for several days in January 2016 before his body was found on a desert highway north of the Egyptian capital. Italian prosecutors have formally put four high-ranking members of Egypt's security forces under investigation for their alleged roles in the slaying.