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Debris of an A321 Russian airliner lie on the ground a day after the plane crashed in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula, on November 1, 2015.
Debris of an A321 Russian airliner lie on the ground a day after the plane crashed in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula, on November 1, 2015.

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    Analyst: 'Most significant terrorist attack since 9/11'

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Analyst: 'Most significant terrorist attack since 9/11'

U.S. intelligence suggests a bomb placed by ISIS may have brought down the Russian plane in Egypt. CNN terror analyst Paul Cruickshank examines the significance.

Analyst: 'Most significant terrorist attack since 9/11'

U.S. intelligence suggests a bomb placed by ISIS may have brought down the Russian plane in Egypt. CNN terror analyst Paul Cruickshank examines the significance.