Boat, Ventura, used in 9/11 evacuations
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Up to a million people evacuated Manhattan by boat on 9/11

Ten years ago, as the twin towers collapsed around them, hundreds of thousands of New Yorkers rushed to the Lower Manhattan waterfront to try to escape the city.

Up to a million people were later evacuated by ferries and tugboats after the coastguard issued an emergency alert.

Jon Sopel reports.

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