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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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    Egypt: Noise heard before plane broke apart

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Egypt: Noise heard before plane broke apart

CNN's Ian Lee has the latest on Egypt's investigation into what brought brought down the Russian passenger jet.

Egypt: Noise heard before plane broke apart

CNN's Ian Lee has the latest on Egypt's investigation into what brought brought down the Russian passenger jet.