premise: Neither Hydara's murder of that of Zongo, who was deep into a probe seven years ago into the dealings of relatives and associates of President Blaise Compaore when he and three friends were attacked on a lonely road, have been cleared up.
  A representative of Paris-based Reporters Sans Frontieres was unable to travel to the conference because the Gambian embassy in France failed to issue a visa in time, the group said.
  Despite RSF's daily calls to the embassy, no explanation was given for the delay, it added.
  RSF in June joined the Gambian Press Union in condemning an official report into Hydara's murder. It said it was "sickened" by the report by Gambia's National Intelligence Agency, denouncing an official "smear campaign".
   What sickened the RSF and the Gambian Press Union?
hypothesis: travel to the conference