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Debris belonging to the A321 Russian airliner are seen at the site of the crash in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)
Debris belonging to the A321 Russian airliner are seen at the site of the crash in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

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U.S. officials: Airport insider likely planted bomb

A U.S. official tells CNN it's 99.9 percent certain that it was a bomb that likely took down that Metrojet passenger plane. CNN's Barbara Starr reports.

U.S. officials: Airport insider likely planted bomb

A U.S. official tells CNN it's 99.9 percent certain that it was a bomb that likely took down that Metrojet passenger plane. CNN's Barbara Starr reports.