Jaballa Matar's disappearance into Abu Salim
In March 1990 Egyptian security agents seized Jaballa Matar, a prominent Libyan opposition figure living in exile in Cairo, and handed him to the Gaddafi regime, which held him in Tripoli's Abu Salim prison. Letters smuggled out in the mid-1990s were the last firm evidence he was alive, and in June 1996 about 1,270 Abu Salim prisoners were massacred. When his son Hisham returned to Libya in 2012 after the regime fell, he still could not confirm whether his father died in the massacre, later, or at all.