Newscopter Seven was over the scene on Saw Miller River Road in Hawthorne just after 2:30 p.m.
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The crane was being used to help build an Amazon warehouse near the Westchester County police headquarters.
Mt. Pleasant Town Supervisor Carl Fulgenzi said one person suffered minor injuries and another suffered "a more serious injury to one leg."
Both were taken to Westchester Medical Center.
Fulgenzi said all work has been stopped until they evaluate the extent of the damage to building.
The cause of the crane failure is being investigated.
This is breaking news. This story will be updated as more information becomes available.
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