Two songs that really seem to have similarity (not completely, but quite a bit) to the WTC bombing:

   Megadeth
   Set The World Afire

   Red flash clouds choking out the morning sky
   They said it'd never come, we knew it was a lie
   All forms of life die now the humans all succumb
   Time to kiss your ass goodbye the end has just begun
  
   Distorted figures walk the street, it's 1999
   Weeds once underneath your feet have grown into vines
   Bodies melted like a candle, a land without a face
   No time to change your fate, no time left, it's too late
  
   The arsenal of Megadeth can't be rid they said
   And if it comes, the living will envy the dead
   Racing for power, and all come in last
   No winning first stone cast
   This falsehood worldly peace
   It's treaties will soon cease
   No one will be left to prove that numbers existed
   Maybe soon the children will be born open fisted
   We all live on one planet it will all go up in smoke
  
   Too bad they couldn't see this lethal energy
   and now the final scene, a global darkening
  
   Dig deep the piles of rubble and ruins
   Towering overhead both far and wide
   There's unknown tools of World War III
   Einstein said "We'll use rocks on the other side"
   No survivors set the world afire [x 2]

------------------

   Megadeth
   Architecture Of Aggression
   (Dave Mustaine/David Ellefson)
  
   Born from the dark
   In the black cloak of night
   To envelop its prey below
   Deliver to the light
   To eliminate your enemy
   Hit them in their sleep
   And when all is won and lost
   The spoils of wars are yours to keep
  
   CHORUS
   Great nations built from the bones of the dead
   With mud and straw, blood and sweat
   You know your worth when your enemies
   Praise your architecture of aggression
  
   Ensuing power vacuum
   A toppled leader dies(Think of that as the WTC)
   His body fuels the power fire
   And the flames rise to the sky
   One side of his face a kiss
   The other genocide
   Time to pay with your ass
   A worldwide suicide
  
   CHORUS
  
   Born from the dark
   In the black cloak of the night
   To envelop its prey below
   Deliver to the light
   To eliminate your enemy
   Hit them in their sleep
   And when all is won and lost
   The spoils of war are yours to keep
  
   CHORUS