CNN's Chandler Friedman, Carma Hassan, Ed Payne, Greg Botelho contributed to this report.

CNN: Explosion hits fertilizer plant north of Waco, Texas

Thomas L. Friedman is an op-ed columnist for The New York Times.

CNN: Too Soon to Tell

CNN's Dave Alsup, Chandler Friedman, Jason Morris, Ed Lavandera, Greg Botelho, Paul Caron, Chuck Johnston, Ashley Fantz and Jason Hanna contributed to this report.

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