Two sources familiar with the investigation said that Zazi had video of New York's Grand Central Terminal, a massive junction of rail and subway lines, as well as shops and restaurants, which see an average of more than a half-million visitors per day.

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Two sources familiar with the investigation said the younger Zazi had video of New York's Grand Central Terminal, a massive junction of rail and subway lines, as well as shops and restaurants, which see an average of more than a half million visitors per day.

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