Least satisfying investigation ever. From the BBC:
UN Says 'Network' Killed Hariri
A UN commission investigating the death of former Lebanese PM Rafik Hariri says the evidence suggests a network of people was responsible for the attack.
No individuals were named, but the investigators said what it called the "Hariri Network" might also be behind other deadly attacks in Lebanon.
What exactly were the other possibilities? That it was a lone killer who, you know, figured out Hariri's schedule and detonated a sophisticated bomb as Hariri's car was passing.