Ceremonies are being held in Paris in honour of the nine French nationals killed when a Greek fighter jet crashed in Spain. <br /><br /> The bodies of the victims were returned to France on Thursday. <br /><br /> The two Greek pilots of the F-16 jet were also killed.<br /><br /> Investigators say the crash was due to a technical problem during takeoff and the crew had attempted to eject. <br /><br /> The nine French personnel killed were on the ground.<br /><br /> More than 20 other French and Italian air force officers were injured and several remain in a critical condition.<br /><br /> The exact nature of the technical problem has not been disclosed and officials say a full inquiry is continuing.<br /><br /> The accident happened during a NATO exercise at the Los Llanos military base in Albacete.<br /><br /> The crash on Monday was described as the worst loss of life during a NATO exercise in living memory.<br /><br /> Witnesses say the jet lost power and then crashed into half a dozen other jets on the ground, resulting in raging fires.<br /><br /> Tragic crash of #Greek fighter
