A U.N.-mandated investigation has confirmed that an explosives-laden truck caused the blast that killed former prime minister Rafik Hariri, the probe's chief said Friday. Swiss and German experts who examined the site of the blast established «without any reasonable doubt» that the explosives were not buried in the street, as some have speculated, said Detlev Mehlis, AP reported. «We are talking here about a probability of 99.9 percent» that the explosion was above the ground, he said. Hariri and 20 others were killed when his motorcade was blown up on Feb. 14 in downtown Beirut. Asked whether the truck was parked or moving Mehlis said he did not know and was trying to find out. He said the explosives were most probably placed on a white Mitsubishi Canter pickup truck that may have had a gray tarp covering its load. --More 1359 Local Time 1059 GMT