The Sawmill Fire began April 23, 2017, when an off-duty Border Patrol agent hosting a gender reveal party shot a target that contained Tannerite, an explosive substance, that would reveal a pink or blue smoke. The explosion sparked the fire.

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Johanna Eubank is a digital producer for the Arizona Daily Star and tucson.com. She has been with the Star in various capacities since 1991. Contact her at jeubank@tucson.com