Grieving residents are calling the 19 firefighters killed while battling the Yarnell Hill Fire, "heroes." An investigation is underway to understand how the elite unit got trapped, and how to prevent a tragedy like this from happening again. Robert Kovacik reports from Prescott, Arizona for the NBC4 News at 5 and 6 p.m. on July 2, 2013.
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Prescott Mourns Fallen Firefighters
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