Disasters, accidents

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Across
  1. 2. Train collision or derailment
  2. 3. Aircraft disaster
  3. 5. Sudden and violent burst
  4. 6. Suffocation in water
  5. 7. Ecological catastrophe
Down
  1. 1. Uncontrolled blaze
  2. 2. Collision on streets or highways
  3. 4. Ingestion of toxic substances