Six people, including an entire family on vacation from Spain, were killed when the sightseeing chopper broke apart in midair and crashed upside-down into the Hudson River Thursday afternoon.{ai:summary}<p>It appears that no content was provided for summarization. Please provide the text or topic you would like summarized, and I will be happy to assist.</p>

Hudson River helicopter crash investigators will probe pilot’s experience, possible mechanical failure: sources

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