Did Hezbollah Assassinate Rafik Hariri?

According to Germany’s Der Spiegel, United Nations investigators now believe “Hezbollah assassinated former Lebanese Prime Minister Rafik Hariri”:http://www.spiegel.de/international/world/0,1518,626412,00.html on Valentine’s Day in 2005. Der Spiegel might be wrong, and, if not, UN investigators themselves might be wrong. I’m no fan of Hezbollah, but I need more evidence before I’m willing to say “Hezbollah did it.”
Even so, this could be an enormous bombshell in Lebanon where voters go to the polls in a few weeks.
UPDATE: The Der Spiegel story isn’t sourced, so it could be bogus. But “NOW Lebanon reports”:http://www.nowlebanon.com/NewsArticleDetails.aspx?ID=94770 that the UN spokesperson for the tribunal has “no comment.” I’d expect the spokesperson to deny the story if it were false. At this point, I’m willing to assume the UN really does think Hezbollah did it.