Ground zero by Alan Gratz crossword puzzle

12345678
Across
  1. 2. where the twin towers once stood
  2. 4. is what flew into the twin towers
  3. 7. ruled over Afghanistan during 9/11
  4. 8. a piece of rubble
Down
  1. 1. the ones hijacking the planes
  2. 3. the space between the ground and first floor
  3. 5. causes a large explosion
  4. 6. large and dangerous fire