Reinforcements poured in Monday to battle a runaway wildfire in Arizona that quadrupled in size overnight after killing 19 firefighters in one of the worst such incidents in US history.
A sign reading "Heroes" is displayed on a fence outside of Station 7 on July 1, 2013 in Prescott, Arizona. 19 firefighters based out of Station 7 died battling a fast-moving wildfire near Yarnell, AZ on Sunday.
The Yarnell Hill fire -- which killed all but one member of a 20-strong "hotshot" team -- caused the biggest loss of life among firefighters since the September 11 attacks, and the most from a US wildfire in 80 years.
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