“Three persons were taken into custody from the aircraft – a Senegalese named Ahmed Khalifa Niasse, Mansour Omran El Saber who at the time was a member of the Libyan ESO, and one Mohamed El Marzouk. The evidence did not establish any connection between any of these three arrested persons and the briefcase and its contents.”
Zeist Trial. Opinion of the Court: §52.
Here is the official document listing all the material seized during the search at Dakar Airport on 20 February 1988.
Notice that the document lists a box of 25 9mm bullets. Also, it may be worth to notice that the suitcases of the two Libyans do not contain anything suspicious. The explosives, weapon and material are all contained in a suitcase that seems to have belonged to Ahmed Khalifa Niasse.