premise: International condemnation was swift, with the US embassy in Beirut branding it a "barbaric" murder of one of Lebanon's "greatest champions for liberty and freedom".
  Pro-Syrian President Emile Lahoud said he was "outraged" by the killing, describing Tueni as Lebanon's "symbol of freedom".
  "His death only serves the enemies of Lebanon who have been exerting all efforts to weaken the country."
  About 30 other people were wounded in the attack in the Christian suburb of Mkalles as Tueni was heading in a convoy to his Beirut office at around 9 am (0700 GMT).
  A dozen cars were turned into charred shells by the powerful blast, some flung into neighbouring woodland, and windows were shattered as far as 500 metres away.
   What caused windows to be shattered?
hypothesis: the attack