Terrorists generally select targets where they can cause most damage, inflict mass casualties or attract widespread publicity. VBIEDs can be highly destructive.

National Counter Terrorism Security Office (U.K.)
Police explosives experts prevent carnage at the Tiger Tiger Club
[Just in case you have forgotten, I gave you the minimum evacuation distances for Vehicle-Borne Improvised Explosive Devices (VBIEDs) here. It's only a matter of time before we see them in the U.S. You should be prepared.--Joe]