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china tianjin explosions dangerous chemical reaction van dam cnni nr lklv_00001805
china tianjin explosions dangerous chemical reaction van dam cnni nr lklv_00001805

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    Dangerous chemical reactions possible in Tianjin

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Dangerous chemical reactions possible in Tianjin

CNN's Derek Van Dam reports on possible dangerous chemical reactions at the blast site in Tianjin, China.

Dangerous chemical reactions possible in Tianjin

CNN's Derek Van Dam reports on possible dangerous chemical reactions at the blast site in Tianjin, China.