Assertion: tower's staircase | /r/HasProperty | destroyed
Facets:
Source sentences:
text: When Flight 11 hit, all three staircases in the North Tower above the impact zone were destroyed, thus making it impossible for anyone above the impact zone to escape.
text: When Flight 11 hit, all three staircases in the North Tower above the impact zone were destroyed, thus making it impossible for anyone above the impact zone to escape.