Fire retardant covers a pick-up truck outside of a home near the Yarnell Hill Fire in Yavapai County, Arizona July 3, 2013. Firefighters labored on Wednesday to extend their grip on a smoldering but still potentially lethal blaze in Arizona that killed 19 members of an elite "hotshots" crew in the deadliest U.S. wildfire tragedy in eight decades. REUTERS/Joshua Lott (UNITED STATES - Tags: ENVIRONMENT DISASTER)